A 8x12-foot footprint covers about 96 square feet of usable shaded area — enough room for a 4-person bistro table or pair of loungers. Below are every published plan at this footprint, including freestanding and (where applicable) attached variants.
For planning, allow at least 24 inches of clearance on every side for furniture pull-out and unobstructed walking paths. If you intend to grow climbing plants, plan for an additional 18-24 inches of overhang clearance because mature wisteria, grapevine, and climbing roses produce a dense canopy beyond the structural perimeter.