So here's one of my signatures. It's a bit old, but I always liked it so I hoped to have some comments ! There it is... I used a render from planetrenders.net
Not bad. Took me a bit to figure out what the text was though. Could use a little more color depth. I hate monotone sigs >.< . However its pretty good.
Yup try to use color balance ctrl + b if your using photoshop and a PC. That usually helps with adding a variety of colors.