Just because you're not using a store-bought set doesn't mean you can't have some coordinating artwork in the baby's room. In our first son's room I accented with Curious George, who was on a wall clock, some fabric I used in his quilt, and displayed a bit on a shelf. For the artwork, I used a couple Curious George calendar pages, trimmed them to get rid of the little nail hole, then glued them down to a piece of 12x12 scrapbook paper which looked like matting. Then I painted wooden frames, and voila! Curious George artwork!
Mod Podge I bought a 12x12" paper pack to cover the 8x8 canvases, since I needed extra inches to go around the edges. Then I drew out the designs I wanted (based on my favorite images from a google image search), cut them out from the scrapbook paper, and mod podged them to art canvases. Here they are: