Well what i do is i make 3 color balance layers and use 1st one just midtones then the 2 other ones i use all the aspects. For Color Balance Number 1 I make a gradient then for the other 2 i use Filter>Render>Clouds. I Hope this helps
make a color balence layer, then do filter > render> clouds. do that a buch of times with differen colors, and there ya go! i hope that was worth a +rep..
most of the time your sigs dont get very eye catching but sort of uhm, plain? hm dunno the right word, but be sure to use contrast layers on top of it