Thanks for all the comments. I love to re-craft things. It is better for the earth and easier on my wallet!
The mirror before I started looked like the hideous paint illustration. So there was no change to the mirror or the frame shape.
I had the foresight to remove the stamps from the backing. (You just soak them in warm water and let them sit. The backing comes right off! Then I laid them out to dry on a cookie sheet lined with paper towels.)
It took a lot of time to line up the stamps up but I applied modge podge on the area of the frame I was working on and also to the stamp. Then I stuck the stamps on. Since the frame and the stamp both had the glue I could reposition them if needed.
The corners were kind of tricky. I worked from the middle of the sides, then out the the edges. So I just cut little stamp patches to fill the holes in!
The idea started with my love of postage stamps. Growing up, my dad collected stamps and I joined a stamp club at school (Nerd Alert!). I always though of postage stamps like tiny works of art. Perfect for a doll house. Being the hoarder that I am, I couldn't bare to waste these pretty stamps. So I saved them. I didn't know what I would do with them. Maybe make some cool collage of stamps that from far way looks like a heart (like a photomosaic).
I don't remember how I connected all my thoughts together, but I did and I am very proud of the results.
Thank you all for all you comments! I am feeling the Craftster Love!!