Here is a recent post I did for If It's Groovy about using photo collages. You can see the original post here: http://ifitsgroovy.blogspot.com/2011/10/sheenas-collage.html
I just love using photo collages. I really like having a lot of pictures on my pages and using a collage is a great way to achieve that. I have a program on my computer that I use to create my collages, then I can print at home or upload them to have them printed for me. Another way that I create collages is by using my punches to punch uniform pictures and arrange them in a grid. You can also trim your photos free hand and arrange to create your collage. However you do it, working with collages is an efficient way to use the many photos we all take.
Do you collage your photos? I would love to see some of your pages using photo collages. Feel free to post a link to your galleries so I can check out how you use photo collages.