Heres a new sig i made after reading a tutorial on planetrenders (love that site) tell me what you think (really the only thing i used from that tutorial was the text and somewhat the background and border)
The color of the render doesn't coordinate with the background whatsoever. If you're going to make a sig like that, look at the focal and try to make a theme that would go good with it. The lighting should be placed, and there should be some color blending. Gradient maps and photo filters help me the best .