You know that effect in black and white pictures when one element, such as a rose, is the only thing in color? In the example I suggest, it would be a black and white picture with a red rose in it. I've been wondering how to do that effect for years in Photoshop (I have version 7.0) and had tried a couple of different tutorials to no effect. And then I found this one, and it's super easy. Try it if you have the software (not sure if it works in stripped down versions of Photoshop) for really cool effects.