Alright, I've picked it up.  I'm trying to think of what to draw as my character.  I've thought of bicycle, a bunch of cats, The Pac-man gang (Mr., Mrs., and the ghosts).  I've thought about drawing anything that's supposed to be alive as something inorganic, and anything that's a machine, like that rocket ship as things alive.  There's just too much to choose from!
Edit:  I went with an Ice Climbers totem.  Popo on top with a hammer, Nana carrying him on the bottom.  She splits into two because she's basically the Hero's legs, but it still looks kind of cool.
At first, everything I drew featured 8-bit video game things.  Clouds were Pac-Man mazes, storm clouds were ghosts after a power pellet was eaten, that vine Vudu showed was a Piranha plant with fire flowers as leaves.  Ice in the water was metroids.  Things like that.  Then, it just became tiresome to draw this stuff every time a new type of platform was introduced.  Now, everything is just a scribble or a solid, single-color block.
The game would be very difficult if you chose not to fill in things at all, or just filled one pixel or something.  I thought about doing that one, but it would be nearly impossible.