This block works as an 8x8 grid.
If you cut . . . .
1 1/2" strips, you'll have a 8" finished block (2"F X 8)
2" strips, you'll have a 12" finished block (1 1/2"F x 8)
2 1/2" strips, you'll have a 16" finished block (2"F x 8)
3" strips, you'll have a 20" finished block, (2 1/2"F x 8),
etc.
Decide how big you want your quilt, how many blocks across x how many block up and down, to get to that size (you can add borders when it doesn't come out "even"), and then how many strips you will need to make the number of blocks you want.
Check that you have enough of each fabric, then go for it!
Good Luck.