A few years ago, I saw this post on Chez Larsson, of Benita's craft corner, which includes framed collections of bottle caps organized by color. Here are a few more pictures on her Flickr Photo Stream. I have collected random bottle caps, not sure what I would do with them, until I saw these!
I continued collecting bottle caps over the years, until I had enough to use. I knew I probably had some frames to use, and as I cleaned the the garage this week, I found two that were perfect, and the right depth. I just wanted to paint them white. I used some left over paint, and transformed them.
Then I cut some mat board into two squares to fit the frames. They are a little larger, as they will attach to the back of the frame to create a shadox box effect. I laid out the caps and arranged them until I liked the way they look. Then I measured on the mat board where they would go, making dots to show where each cap would be, so they would line up and be spaced correctly.
After that, I just attached the mat board to the back of the frame, added a hanger, and installed them on the wall in my kitchen!! They turned out great!!!