Baller, you need to just read some tutorials and read some PSDs.
I you'st to rip sigs in PS just to see how they would turn out -- I never posted them or uploaded them but it helped me a lot to see someone's work with my vision.
I would basically just change the render or the picture around to what I wanted, and then diagnose what was good and what was bad in my head.
Then I would make something from scratch with the same principles -- and it worked wonders for me.
Just make sure you don't use the same layers or anything that another person uses.