If you don't want to make a project to submit, you can post your art entry here.
Note that art entered in this way won't be rateable for the jam.
Got a bit excited and made a mockup for "Nokia Wars", Nokia's take on Nintendo's "War" series.
Made a title screen, a Commanding Officer (CO) select screen, a VS loading screen (showing 2 of the game's COs as well as the map the player has chosen) and a gameplay screen showing the players funds, units and special meter.
This was my first Art Jam and had a blast with it, thanks for the opportunity to participate!