Things to make out of old PCBs

I have some old PCB scavenged from some electronics and a router that no longer worked. They are quite big. I may scavange some parts from them in the future but they are pretty much useless but they look cool. I was wondering what i could make out of them something decorative or even functional. 

Picture of Things to make out of old PCBs
You want functional then start looking up what parts you have available there and see what you can come up with. Otherwise hang them on the wall or something.