A guy I know wanted to completely cover his forearm with skulls, and then blend them all together with smoke in between. These are the designs I made for him.
There are only so many poses you can do with a skull. Since it doesn't have skin it can't smile, frown, wink, furl it's brow, etc... I told him he should have the tattooist mirror some, and add and remove eyeballs from some for variety. That seemed like enough skulls to get his arm covered.
When I gave him the skull designs I told him a skull-covered forearm probably wouldn't go over very well on job interviews. he just shrugged his shoulders as if he didn't care. If he doesn't care, I don't care. He usually buys me a pizza for payment.
Another time he wanted me to paint harp-strumming angels for him. He told me I'd get one pizza for each angel (as a wooing technique,) and everyday he'd ask, "You got those Pizza-Angels done yet?"