I've been playing around with photo apps for my MacBook Pro. First I bought FX Photo Studio for 99 cents, which gave me lots of filters and many photo frames. With it I made these two variations on photos that I've recently posted. I liked the effects and they were fun and easy to do.
Then I bought PicFrame for another 99 cents and made this quick photo collage. It was a lot faster than using Picasa, since you just popped the photos into the template.