Sorting by theme, ALL the things together?

Depends on how your brain works .. it wouldn’t for me, but I can see it working for one of my kids.

Yes I do this. But it all fits in a iris case. I have about 7ish themes that I have in cases. Other themes that I have very little of I just keep the items in an old page protector in a paper organizer. I try to have larger themes when possible, ie animals instead of breaking it down by zoo, pet, water animals, etc.

Given I'm generally theme-challenged & tend to buy versatile papers (e.g. solid cardstock & classic patterned papers, such as stripes, plaids, dots) & tools (e.g. stamps, dies, stencils, embossing folders), theme-based organization doesn't work for me. However, if you approach scrapping & buy supplies in themes, it may be ideal for you. Consider giving it a trial run with a theme you intend to scrap a few layouts/cards/whatever with next. Gather all your supplies for that theme - papers, embellishments, tools, etc. - in one container/shelf & see if you like it. If so, you can transition your supplies to the theme-based organizational system project-by-project if you don't want to tackle your entire inventory at one time. If you don't like the theme-based approach, you can simply return the relatively few supplies for one theme to your existing organizational system. Best wishes...

Definitely depends on how your brain works, how you scrap, and what your stash looks like.

I keep all my Christmas stuff together with just a few things that are Christmas-but-not-JUST-Christmas pulled out. I think it also depends on how you actually store stuff. I'm assuming you're watching Totally Tiffany and in most ways I really like her systems, but I just don't have the space to organize like she does, even if my crafting style was more in line with what she does.

I think if you started to sort things her way and couldn't decide which theme it would go into it would be a sign that your brain or stash doesn't work that way.

Yes, everything goes in one bin. Now if I have too much I might put the paper in one bin or like with baby. I might have infant in one and toddler in another, and might have boy and girl split in 2 bins.

It works for me to have everything together like that.

^^^ THAT. You have to think thru your process for creating a card, scrapbook page, project, and THEN decide how to store your supplies so they match the way you work.  I've done scrapbooking for 25+ years now, and I've only recently figured this out for myself, lol. I will never use 'pretty boxes' or "whatever's trendy" for storage 'just because' ever again. (hopefully not, anyway)

There is no way I would do 'everything of a theme together' because that's not how I scrap.  I will pull together papers from categories like tone-on-tone, stripe, Southwest, vintage, etc. and use them all on the SAME layout.   There's no way I would get anything accomplished if I had to pull out ALL of my 'vintage' stuff just to find one piece of paper to (maybe) use on a layout about a totally different topic.

All of my supplies are separated into the types of categories that *I* use when looking for them: 1) paper (subdivided into categories such as the ones listed above); 2) 3x4 and 4x6 cards (subdivided into categories just like the paper); 3) washi tape / ribbon (all in one case); small embellishments (separated by type, in 4x6 photo cases); 4) stamps I use on SB pages (stored in a 12x12 iris case), 5) stickers and die cuts stored in 3-ring binders (separated into categories similar to the paper categories), etc.  I decided to store my things this way because that's the way I approach a project:  First I look for papers, then I look for stickers + small embellishments, then I decide if I want to stamp on the page, etc. etc. 

The only exception to storage this rule is Christmas-themed papers and embellishments, because I have so little of it.   THAT all goes into one 12x12 Iris case.  But even then, the stamps, washi, ribbon, etc. are stored with the rest of my other supplies of that type.   I don't want to miss out on an opportunity to use a red/white striped ribbon or washi tape on a random scrapbook layout because when I bought it originally, Michael's decided it was a Christmas design.

It also doesn't have to be all or nothing. Some of my paper is organized by theme, some by collection, some by designer and some by color. As long as YOU know where to find what you want that's what is the best for you.

My stamps are all together but sorted by themes. I'd love to put my embossing folders and metal dies with them too but I don't have a storage solution large enough for that at the moment.

I keep my embellishments by theme in Iris cases. Paper is sorted by theme, where possible, in 12x12 clear envelopes. I don't like having paper in with my embellishments.

Stamps are all together in clear envelopes, standing in a bin.

For me since it isn’t necessarily Christmas it wouldn’t have gotten sorted, it would have stayed with the general population.  Now, the washi tape that has Rudolph faces would be in the Christmas bin.  
The only things in my Christmas bin are distinctly Christmas.   

You don’t have to sort everything into categories.  

I scrap & store like you! ( I have a couple of planner only items too ) but I store by type of item because when I’m looking I’m looking for a thing.

Things are by theme within their own storage area ( dies are in ‘trays’ by theme. Die it’s ephemera are also by theme.

Yes, but... only for a few categories.
2 Iris boxes for everything winter and Hanukkah. 1 Iris box for Disney. 1 Iris for baby.
Halloween can fit in a ziplock bag now.

ETA: I lied. I do have a bag for Halloween paper and flat things, but my Halloween stamps and dies are in other places.

I am not someone who sorts by theme or by color. I’ve tried both and neither works with the way I think.
I put all of my die cuts together, all of my alpha stickers together, all of my stamps together, all of my paper together, all of my ribbon together, etc.
Exceptions are Christmas stuff goes together and I keep many kits together (at least until I use a good chunk of them—then the items go with the respective items.)

I had to figure out how my mind works, try a couple of different things/ways, and eventually find a process that works for me. It’s still a work in progress, but at least I’m making progress with my organization.

I keep one container for Christmas everything ,one for Basketball for my sons album
Cardstock and PP by colour
Embellies by type- wood veneer/enamel dots/puffy stickers etc
Stamps by theme categories
The only exception is all my unicorns-OA is all together/sassafras all together
Hmmmmm- but when I scrap I make up little kits enough for 3/4 pages. I have 6 of these made up ready to use and any one time
I just pull out the photos and pick out the kit that seems a good match

I only have a couple of things that I sort by theme, and how far down that "everything together" road is totally dependent on the subject. I keep very obviously themed birthday embellishments in a 4x6 iris photo box, including words like "celebrate" which I'm unlikely to use on other layouts, and even if I want to I know they live with my birthday supplies, but stamps and papers live with my other stamps and papers. Christmas I've gone more all in for. Papers are still stored with other papers, but all other embellishments, washi, stamps, etc are in one place. As others have said, a candy cane stripe washi would live with my other washi, but reindeer washi goes with the Christmas supplies. Each year when I scrap my December photos I build a kit starting with the supplies I have here, then add from the rest of my stash.