I feel a bit silly asking for help with a casual game--but I'm really stuck!

In Death on the Nile, I'm at level 7 or 8 and am in Tim Allerton's room, where I need to put together a 'complete rainbow'. I get the jist of it and have found most of the rainbow pieces, but I can't figure out where to drop them. Any ideas?
(5 minutes later)--Um, never mind. As soon as I posted this it came to me. If anyone else gets stuck, let me know and I can help!

Thanks! Kristi