I downloaded a program called TouchDraw this weekend. It's not intended to be used for designing quilts, but its functions mean it can be used to do so. That's what I used to make the plan for my Oakshott quilt.
I also used it to play around with the block I made over the weekend - Dat Star. I don't think I will be making a whole quilt's worth, but what would it look like if I did?
Option 1: without sashing, each block rotated 90 degrees from the last.
Option 2: with sashing, and a wide border.
With all the different busy fabrics I used, I don't like this particular version of this block as a quilt. But, I like the secondary design on the un-sashed version, so I can see potential for that one with a solid background perhaps.
What do you use to design your quilts? Graph paper and pencil, software, or maybe you can keep it all in your head?