I would reccomend going to the library and looking at art books etc. Atleast that is what I do when I run out of ideas.......and I feel like it should be a personal choice that comes from you. Not necessarily copy the art but if nothing else you may think up a great idea and go from there. Do you have a decent library?
*Ahem*
Tattoos? i'm gradually filling up my shoulders with art nouveau inspired designs... they always look good in black/grey/blue. Just a thought.