what you'll need:
12-15 concert tees
30 yards of extremely strong, double-sided adhesive
1. Cut out the front of each concert tee into large, roughly equal-sized squares.
2. Take one tee square and cut two strips of adhesive equal to the length of the square's sides.
3. Peel off one side of the backing of one of the adhesive strips and stick it along one side of the back of the tee square (the side without the logo/artwork). Peel off one side of the backing on the other adhesive strip and stick it along the other side of the back of the tee square.
4. Repeat step 2 for each of the tee squares until they are all backed with two strips of adhesive.
5. Plan out a rough grid on the ceiling of your car (leaving a space for any ceiling fixtures) with the tee squares before adhering them.
6. When you've determined a layout that works, create it by taking each tee square one at a time and removing the visible backings from the adhesive strips, then pressing it onto the ceiling of your car.
17 Tip: Get cheap concert tees on eBay.com or at your local Salvation Army.