I do that too, i even did it for your request and the first hit on an image search was something that could be quite easily turned into a token with minimal editing to suit whatever style you prefer for your tokens... ...that being said, i didn't look into any potential copyright issue with using the image which is why i didn't post it as a reply to your question. But in a nut shell, if roll20 does give you what you need a quick and easy search will. Unless you are like me and decide to look for skeletal/zombie baboons to throw at your players!