If you decide to do the mustard, my recommendation is to put it on very thin. It will dry quickly, then you can wash it off and do it again, and again. It takes a few coats for it to look really cool.

Also, I would recommend putting it on in small swirls. If you try to put in on all in the same direction, it can look "streaky." If that makes any sense <img src="/ubbthreads/images/graemlins/smile.gif" alt="" /> The small swirling gives a lack of pattern and just looks better.