Was thinking of making 63 blocks. I've trimmed these down to 9 1/2 inches, from the 10 square papers I started out with. 7 blocks by 9 blocks would give me a top measuring 63 x 81 inches before adding borders to make it fit a twin/full bed.
Not happy with the selection of strips I'm down to new, so I don't know that making more blocks would be a good idea. Then, again, I don't really want to be left with a bunch of strips...........unless I want to make a piano-key border.