Hamburgerpanda is an Etsy favorite of mine.  I haven't bought anything yet, but I plan to.  Hamburgerpanda prints and cards are scientific-cute, if such a category exists.  Cindy Yep is the San Francisco artist behind Hamburgerpanda.  She says she is inspired by science fiction, nature, and Asian pop culture.  I particularly like her underwater robots, like Roboctopus and Turtlebot.