7. This is the C4D render time. Now, in case you wondoring what the heck is a C4D render, well, I'm not exactly sure what to tell you. xD Anyways, you can find them at deviantart or look for a site that has them via google.
Paste a nice, C4D render on your sig in a new layer (you might have to move the C4D around a bit):
^Set that layer to Linear Dodge and erase where need with a soft brush:
How do I do that on GIMP?