I made this one for a swap-bot swap that was about mosaic art, I tried to use as much scrap paper as possible. I'm really happy with the way it came out, it was quick and fun to make and real cheap and easy.
2 pieces of cardboard cut from a cardboard box. the pieces should be the same size and each of them should be the size of the final picture frame - cut them at the size of the picture plus 2 inch to each side and to the bottom and top.
Acrylic paint in a color of your choice
Elmer's glue (or any other glue - this is what I had)
Cool paper scraps - magazine clipping, wrapping paper, candy or food wrapper and labels, postcards or whatever you feel like using.
Craft or exacto knife
Pen or paints or markers if you want to
OK - Let's start!
Step 1: Cutting the frame
The piece that would go in the front should have a hole that's smaller then the piece that would go in the back.
I mesured 2" on each side from the piece in the front and 1" on each side from the frame in the back.
Throw away the small rectangular that's left after cutting but keep the bigger one.
Step 2: Painting
Leave to dry.
Alternative - if you like the way cardboard looks, you can leave it like it is, or another option - use any paper you like and paste on the frame.