my method for making many scrap quilts
1) Find a pattern or block you love
2) Make a note of the sizes of patches you need
3) Decide the "flavor" of the quilt; will it be totally scrappy or will it have a theme like 1930's reproductions or Civil War reproductions, etc.?
4) Cut some patches the sizes you need and put them into a project box
5) Make a few blocks from those patches
6) Add more patches from other fabrics as you are using them for other projects
7) Make a few blocks from those patches
8) Repeat 6 & 7 until size needed (or until you're tired of this one--then go on to the next!)
Thus you have the Sourdough method of making quilts.
I usually have 6 to 7 scrappy Sourdough Quilts going at a time. I cut 1-1/2" squares, 2" squares, 2-1/2" squares, etc. as well as strips of varying widths like 1-1/2", 2", 2-1/2", 3-1/2".
I also cut larger squares for making 9-patches and half-square triangles. For those, I cut 4-1/2" squares, 5" squares, 5-1/2" squares and 6" squares.