I choose FotoFlexer because I am already active on Shutterfly and Photobucket and have used them a great deal. I used our holiday sing a long for my pictures because the last song is "teacher driven" and always entertaining for all the students.
http://fotos.fotoflexer.com/22128e3b89504c591e9e035a03de26a5.gif
For Photo Peach I used our trip to the pumpkin patch and our pumpkin carving activity that we did as part of our unit on living things and life cycles.