Besides being lovely wall art, this indoor herbarium at V & D is educational as well. This example was created with fall leaves but it works for any season. Dried flowers would be so pretty too! (Use Google translator if needed.)
I'm really intrigued by the idea of glued layers of cardboard as a craft medium and this simple cardboard house project at Sokeen seems like a good project to get started with. I also like the painted corrugated edge detail! (Use Google translator if needed.)
Find out how to make this bunny wall art at Leon, Not On The Walls! The same method could be used for anything you like; older kids can cut the wood, younger kids can paint, and everyone can have fun creating an image from the wood scraps.