I've been looking into Image Comics lately. And I've liked what I've seen about their submission policy. When they mentioned a colored cover, I was wondering how I'd go about that. My favorite color medium is easily pencil (prismacolor or what have you). But I realize I haven't seen this done for any comic covers at all. None that I can remember anyway. This could be good because I'd be striking my own out there, and the variety could only help me out. This could be bad because I usually only ever see very cut and dry solid tone art on comic covers, and that it may just be an easier and less expensive printing process (in which case my idea would get dropped like a bad habit for costing more money!) or they just plain don't feel lucid colored pencil is appropriate.
Are there particulars I should know about before humoring this idea any further?