Here's a really cute idea. Frame quote bubbles, use a dry erase marker to write funny things your kids say. When you are ready to switch the quotes, have the child take a picture with their quote and make a photo book of quotes. Cute for school too!
Cloud lights ♥ one of the most awesome ideas ever. Use: cotton batting, a paper lantern, & 3 flameless candles. Pull at cotton batting til it looks fluffy & cloud-like; & hot glue it all around the lantern. Add lights to lantern. Clouds are ready to hang!
corner gallery wall - without the specially made corner frames. Would need to be on a corner that is in an open area; this would be really overbearing in a tight hallway. But in the right space it could look amazing. Very art gallery.