Help me re-create these! Baby Shower Decor

Your link doesn’t work, are they the ones form the Etsy?  If they are the description says they can be customized in any color so possibly not one particular line of paper.  They almost look like they’re made of ribbon.  If you could find ribbon in the gingham you could use Heat N Bond to fuse it to solid cardstock.  

This Doodlebug paper looks a lot like the yellow paper you linked. I'm not sure about the grey paper but maybe this one could work. 

Photoplay has a new paper in their latest Easter collection with a similar art style as the stickers, and features flowers and bees that could work. One side is blue, one side is pink.

The first collection that came to my mind was Carta Bella's Oh Happy Day. Again, it has a softer illustration style to match the stickers, cute bees, florals, and gingham patterns. In fact, the digital version of this collection is currently on sale, and you could easily print out any two patterns you like to make a custom double sided sheet of paper for this project. You can also alter the color of digital collections too, to better match the party decor.

Edit: Found another paper that could work from Heidi Swapp, it is called Mellow Yellow.

Not gingham (but dots)

www.scrapbook.com/store/ecp-ds20029.html