Seat cover for dining chair. Clean, simple wrap around design that fits snugly around legs with velcro. This would be simple to make by altering this DIY: http://www.athomeonthebay.com/2012/03/dining-chair-drop-cloth-slipcovers.html
add upholstery to chairs. Cut MDF board to size, lay on chair, drill four holes through board and seat. Take board off seat and put carriage bolts Through board. Glue on foam (already cut to size), staple on fabric, and attach to chair.