I love challenges as it allows one to try things one might not ordinarily try, such as altering the color in a photograph.
When I saw the Gingersnap Creations' theme for their Chestnut Challenge, I KNEW which stamp I HAD to use. Since I chose a "photo" stamp, I didn't want the "mall" to be black and white too. Sooooo, using a ghost town image from Altered Pages "Ghost Towns" collage sheet, I stepped outside my box and changed the color using one of my photo software programs! I am not sure I will employee this technique lots, but it was fun to try something different!