One of the newer tricks I've picked up in photoshop is the hue/saturation adjustment under the image-adjust button. Just by targeting the pic, and then sliding the bar for hue, all the colors change in unison. The new signature stamp I use is a good example: I just slide the hue until the colors in the signature match the background or charachter colors, then drag to where I want it and flatten image. Here is planetman, with the hue moved to -140. Makes the planets on his arms look like chocolate chip cookies
