Since I was told this would be the place for banners/sigs I make as they're considered art, here is a Rukia sig I made since I'm her fanboy...
Here's what I did using the Gimp program...
1. Opened a blank document sig size.
2. Brushed over the area with a black charcoal brush.
3. Smudged the brushing for effect.
4. Added white cubes with the brush.
5. Added black cubes to balance it out.
6. Added in the Rukia render at around 65% opacity.
7. Added an orange gradient map at 7-9% opacity.
8. Added a yellow gradient map at around the same opacity as above.
9. Added the text in a small but readable font.
10. Added a border and resized it to fit.