I'm not big on gallery walls, but I like this idea. Make it a small smattering over a hall table/entryway bench, and fill in spaces with small items/letters instead of just a bunch of similarly-sized frames.
Easy Paper Butterfly Origami - beautiful origami butterflies for kids to make. These look super effective, would look great as a wall decoration, mobile, mirror or picture frame decoration, but also as a hair piece or as part of a greeting card. One lovely butterfly craft for kids. Lots of gorgeous uses!