Ok! So ...many times when i wanna draw something ..at least the circuits , because they looks horrible , i must fill the free space. This ( adding element to can paint ) can affect the electronics. It would be verry cool to make cover that you can draw and it is non-material . You put it on somethings and the project is the same , but you can't see it. Sorry for my english...Is verry hard for me to explain all these.
Another advantage : PEOPLE CAN'T SEE WHAT'S UNDER IT , so they won't discover the mechanism.
Another ideea : There is a button Publish or not ... Make a button Copyalbe or not...This is really important!