Selective Coloring
This tutorial was made for Photoshop Elements 6.
Step 1: First you have to find an image you want to use. Here's mine:
Step 2: Now use the
Polygonal Lasso Tool, which looks like this:

, to mark all around the object you want to keep the same color. Once you've clicked your way all around the object, double click to complete the marking.
Step 3: Then you have to rightclick on the image and select
Select Inverse.
Step 4: Go to
Enhance >> Adjust Color >> Remove Color. Then right click and choose
Deselect and you're done. Here's my finished result: