Thinking out of the box: maybe you could make up some kits. Pre-cut the fabric for a simple quilt top or wall hanging; put it into a ziplock, or project envelope along with instructions; include your card with an offer to line and quilt the item for $___.
Other kits could include simple aprons, pot holders, pin cushions - things you are familiar with and would be comfortable supplying typed-up directions.
and fat quarter bundles!