I've done nothing other than lay them out on a 6'X4' grid on the sun room floor. I have no particular love for any one piece - it's just stuff gathered up. Empty frames that I put pretty paper in, etc. I was thinking about displaying some travel post cards in the white shadow box thingies. I do think there needs to be more round shapes, as the rest of the room is pretty wooden, square/rectangular and leggy. Since it is a dining room, I might introduce some plates - I have some interesting pewter plates that might mix in pretty nicely. I'll try to get a picture of those. It is worth noting that I'm not a huge fan of symmetry. That's too formal a look for such a funked-out space.
Okay, HGTVers, give me some ideas for the collage.