I had some grass cloth wallpaper already, so I cut it to fit inside the frame of the picture. I didn't remove the old picture, just cut the wallpaper to fit over the glass on the frame. Then pulled out my handy dandy glue gun and glued the wallpaper directly to the glass. Then I centered my decal. All there is to it, new picture for $1! I think it turned out pretty cute, and I love the fact that I didn't have to buy anything additional.
I'm linking up to Kimba's DIY Day! http://asoftplace.net/