I love Photoscape for collages. I made a collage in my previous post about the kids playing with bubbles. You literally just click and drag pictures into a template. They have a bunch to choose from and it's SO EASY! (I used Picnik to make the title on my kids' blog. I prefer it for adding text.)
So until I get that tutorial in Elements, my edits will be in Picnik or Photoscape. Gotta love free!