I've been thinking about color stuff, but just can't come up with how to really do it. However, I think sub-45-degree turning is gonna happen soon. Probably 15-degree to start, and see what can happen there. 45 degree turns do provide some fun stuff, though...

Edit: Just made a small change that will make things look prettier, though. If you have the command string XYZW, the command string XYZWXYZW is 100% equivalent, except for the shading (due to the cell values looping around). So when you put in a command string, it's automagickly extended to > 64 bytes now, guaranteeing smooth shading.