I submitted this a while back but it hasn't been posted yet, so I thought I'd put up a link in the mean time. The subject matter is a little... odd, for combustion, but I think you may find some good tips for vector graphics in there, if you're new to it 
It's a HighEnd exclusive, so it's not in the regular tutorial list. Have fun!
Tattoo Design: Making Patterns in discreet combustion
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Brian Demong
Publisher, Combustion Instructor
Mesmer Animation Labs