If you cannot draw, there are a lot of free resources - openclipart, opengameart and so on. Another approach is to pick a game style where the drawing ability matters less - vector graphic, or 8 bit pixel, or LCD grid (for example).
I cannot draw either, at all I have had some success using 3D Modelling in the past, because you can do basic simple shapes which can look quite effective (and there are a lot of free 3D models out there) and the modeller deals with subtleties of shading, shadow and lighting and so on.
Another option which I haven't tried is copying a real drawing - a bit like tracing over it ?