I made my own diamonds for tumbling blocks. I drew diamonds on a piece of printer paper. I only drew the stitching lines and left enough space for seam allowances. I printed on the fabric (using the copy function) on my inkjet printer. Then cut the pieces apart and sewed by hand on the printer stitching lines. I did have a number of paper jams though.
you could also scan your drawing so you can re-size the pieces if you decide to make another quilt with different sized blocks.