Shingo Shimizu is a veritable wizard with regards to eye popping vector illustrations and no better way than to show these skills than with some skulls. La Carnita - 2013 (image below) is a lovely example of restraint and mystery. The print was limited to

One can never become bored with lovely patterned skulls as seen here with these detailed works of Kelly Merrell. Her detailed illustrations make some great greeting cards, available to buy from her online ETSY store and you could pretty much see these designs being used