Hmmmm... That's one way of taking up the space I guess. Still a lot of empty in there though.
Here's a favourite of my own that I have been looking for the pictures of for a while.
It's was given to me by a friend a couple of years ago who knows that I like playing with PCs. I played with it for a while and then sold it on before it annoyed me too much
ITX sized board in mATX case - Check
Plenty of room for a PSU, but use a laptop brick - Check
Room for expansion, but no expansion slots on the board - Check
All in all, a cheap solution (by using a case from the existing parts bin) to a low power desktop, but in a case at least 5x bigger than it needed to be
Aaaaaaaaaaaaaaaaaaaaaaargh, it offends the SFF directive greatly