i used PS CS for this tut
diffculty: 2/5
im gonna show u how to make a 3D grad sig

1. turn your paint bucket to a graidnt tool and change the style to copper, (the pic dosnt show it to good, it is the brown looking one)
Clicky

2. change the mode to diffrence

3. start going crazy dragging the tool everywhere and in every direction,( note the less u do it the more 3D it will b, the more u do it , it will b more grainy
Clicky

4. hit ctrl + u to change the colour, the more saturation it useally looks better.

thats wut i got i did it for longer so its more grainy and a bit less 3D, jus add a 3pxl boarder and text and your on your way to a 3D grad sig =P

hope this could help u