I like it when they at least have the same color scheme. Matching styles are a great way to go too. But that is just me.
Red is my color scheme, because I go by Scarlett. The color red and Scarlett just go together.
I do like the green you have used. And, the unusual shape of your sig., is very cool!
I have many sigs. and Av's. I switch them out quite often. I get bored. LOL