I am not particularly 'techy.' So after playing around a while trying to do this on my computer here is what I did. This was to help me keep my colors distributed for this project. I did not set out to have a particular color scheme and intend on working primarily from my stash. When I started I just went through my shelves and grabbed a bunch of fabric that felt 'right.' As I finish each block I cut a 1/2" square and use Elmer's liquid glue to glue it down on the graph paper. Easy, fast, and I get a feel for how the colors are distributed without having to take the blocks out each time. I don't like to handle the blocks too often for fear I'll start stretching and distorting them.
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Here's a close up.
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Sorry the pictures are so large. I had been able to put them up smaller but now can't and don't know why.