I've done this before:

NEEDED:

Quantity
V - Item Needed
1: Web Server that you can upload to
1: Image program that can handle .pcx and .gif images
1: Jazz Jackrabbit 2 Program (1.2X)

That's all you need. After you have the needed items, Follow these instructions:
[list=1][*]Start up Jazz Jackrabbit 2[*]Enter MP mode with your charector[*]Find a spot that has a BLANK BACKGROUND (i.e. a solid blue, solid grey, etc.)[*]Stand in front of the square. (make sure it's at least 3x2, lengthwise, around Jazz/Spaz/Lori)[*]Press F12.[*]Exit JJ2[*]Open your Image Program[*]Open the Jazz#####.pcx file in your Jazz2 Directory[*]Crop out excess picture untill you have just Jazz/Spaz/Lori.[*]Save as a .gif[*]Upload to Web Server[*]Volia! You have an image you can post on your signature![/list=1]