Lots of great suggestions. How about offering trips to the big National Quilt Shows like Sisters, Paducah, Houston. Most guilds offer trips to more local shows but acting as travel guide to some of the biggies (maybe even other countries) would be great.
My dream is to convert my large 1750's barn into a studio space. Downstairs would be a wood shop for DH and upstairs my space with huge windows to look over the fields and skylights for lots of sun. Of course a nice spot to relax with a cup of coffee and peruse some great quilt magazines is a must too!