I had this adorable flannel in my fabric dresser that I've been dying to use for something fun and this seemed like a good fit for it. I didn't take a lot of pictures of the process of making them because it really isn't that hard.
I cut out 12 5x5 squares from my fabric then sewed sets of two together with right sides touching. I left a hole on one of the sides to put the filler in.
After I had them all sewn (or is it sewed?) and flipped right-side-out, I filled 'em up. I thought about using beans or rice (cheap!) but thought that they might start to grow something nasty if/when they got wet with one-year-old drool. So I went to Michael's and got Poly Pellets. They're in the doll/stuffed animal making section. They were kind of spendy ($9 for 32 oz) but wouldn't have been too bad if I'd had a 40% off coupon. And I think I can probably get 15-20 bean bags out of the pellets. Super bonus - they are machine washable!
I used a scant 2/3 cup to fill each one. Then I sewed them shut with double seams, just to be safe.