My only window in my room goes outward, so there's a small ledge on it. I've placed my figures on the ledge in lines. I placed the four Turtles at the beginning and some of their comrades in the back. I have the bad guys on the left and the good guys on the right.
Some of the figures were a pain to position to stand up straight, so I had to tape some of their feet in place.
Trouble is its a pain to move them all and dust the ledge, so the wood under their feet in pretty dusty.