Well TEAM arg has some pixel and vector art on the Arduboy it wants to share with the community:
If you're using the art, try (if possible) to credit the artists who made these. You could for example post a screenshot and tag the artist ... a beer would be nice too.
BUT you don't have to ! And it's free !
thanks to @huard_olivier and @JO3RI
PS: if you want to contribute ... let us know