I was considering making an Inkball clone (Haven't played? It's like pinball but you draw lines instead of use the flippers. It came with the XP Touch and Vista computers, but Microsoft scrapped it with Win7. They should have brought it back for Win8.)
But can Construct make a simple drawing system? All I need is something that lets you sketch something, and then erase it either when you hit the eraser button or when a ball hits it. (But if this idea takes off, it could become some kind of Magic Pencil game!)