You may want to sew two strips together end to end to get 10" strips, or larger, for bigger blocks. A 5" strip done diagonally will only make about a 3" block. Though tiny blocks done with 1" strips would be very cute! I also suggest using gift wrap tissue paper as your foundation as you won't have to remove the paper when you're finished. Tissue paper just dissolves and washes away so no need to remove it.
Cari