This week I mailed off 48 Heartstrings blocks to another quilter who will sew them into a top for the Heartstrings project. http://heartstringsquiltproject.com/ . 48 blocks will make a nice size quilt for someone. If you love making string blocks from your scraps, then check into this organization.
I've made 2 tops previously for Heartstrings and sent them off to be quilted and bound by someone in the group. One of those had green centers and another had black centers. Heartstrings will take your blocks, or tops made from the blocks, or finished quilts. Just follow the guidelines on the website for size and number of blocks needed.