these boxes were free outside of a local art store. there were a lot more but i only had so much room in my bag, so i grabbed seven of them:
they are about 3.5"x4.5"x1" and open as shown:
i got them because i figured i could do something neat with them... exactly what, i am not sure
good thing this board is here, so all you crafty people can help me brainstorm!