Powercharge

http://i.imgur.com/fAY5W.png

Last sigs have been dark and contrasted, need some ideas,

Actually I'd say stick with the dark look, looks brilliant.

It does look rather nice with the contrasting colors in the darkness. My suggestion would be to start playing with effect C4Ds, C4Ds in general, and lighting to create even more contrasts in the darkness or around your renders but staying with the dark contrasting look. That is just off the top of my head as a newbie.

nice.