Spruce up your garden shed - don't let it become neglected & ruin the look of your summer party. Give it a good wipe down & when dry, paint w/ a outdoor wood specific paint from Cuprinol or Ronseal. Then finish off the look by hanging decorations from the sides for a summer beach hut look. The Posh Shed Company make a large selection of beautiful ready made & custom garden sheds.
This is my current favorite. 1787 Sq ft. Great house! Efficient use of space (no hallways=no wasted space) great passive solar design with large low windows to catch winter sun and eaves to block hot summer sun. I would extend eves over the side with the main entry and create a covered porch, wood stove instead of FP. Add garage with entry through utility/laundry. Check out version 2 with carport.