I think Dave gave some excellent advice. "Collaborate with an artist" and "learn to draw" are probably the top two ways to deal with the situation... and working with simple shapes would definitely be a good way to start... Very simply drawn comics can be quite popular (xkcd being the flagship example of the trope, but there are many others at different degrees of complexity).
For another example, check out chainsawsuit
; Kris Straub was always frustrated that this simple, quickly drawn strip of his was more popular than the one he spent lots of time on
You might also consider looking into different types of art: photocomics (Like Ask Dr. Eldritch, Surviving the World, Tiny Ghosts, a Softer World, etc...), clip art (Wondermark, Partially Clips, etc), pixel art (Diesel Sweeties, etc) or even use the same image over and over again (Dinosaur Comics). I'm sure with more time spent searching I could find more examples. There are lots!
The methods for comic-making are endless - you just have to find the one that fits you!
And yeah, like Dave said: some of our favorite comics started out like this: http://www.questionablecontent.net/view.php?comic=1