The two images above were both created from the same original photo in the previous post. This time I opened the photo in Photoshop, then used Image Adjustments Curves. In the Curves window, you add points to the curve (by clicking your mouse on the curved line) and drag those points around to change the colors in the photo. I love using this option to print out variations of photos to use in making collages!
P.S. If you try this out, I would love to see your finished efforts!