I'm not too good with visulizing color placement, so I like to drop the colors into a quilt to see what they are going to look like. You can actually scan your fabric, but I've found that their fabric library fits my needs. it's more like where the lights and darks will go. I have also designed a couple of quilts and hope to do more of that. I will say that I have a long background using various drawing programs. I find it easy to use.
I found that quilt-in-a day has the best price by far:
http://www.quiltinaday.com/shoponlin...ay.asp?i=28132