Hey,
I am making a background for my MBP and I want to make it of pictures of me and my friends. What I want to do it remove the background of the pictures and make a collage with the parts i want. Is there anyway I can do this without photoshop?
preview also has a mask / cut tool now as well under select (tool bar) > lasso or instant alpha, simple and free you can free transform the dimentions after copy and paste (like on a different level in photoshop) or flip it
Seashore is sort of a lightweight Photoshop, and it's free. I think it's GIMP-based, but unlike GIMP it is totally OS X native. It doesn't have all the features of Photoshop, but it definitely can handle some erasing and piecing-together of pics.