Astro turf is great stuff for a bit of outdoor ground cover. The only problem is that it can look a little plain with that big area of one color of green. So instead we can use a stencil and some spray paint to add a pattern to it.
Step 1: Supplies
White Indoor/Outdoor Krylon spray paint
Step 2: Making the Stencil, Pt. 1
Tape the two pieces together as seen in step 3 and then cut out the combined shape as seen in step 4.
Step 3: Stencil, Pt. 2
With the paper taped up, flip up the bottom piece of paper and use a Sharpie to mark the middle of the stencil. This is what you will use to line up the stencil when spray painting later.
Step 4: First Tape
Step 5: Marking and More Tape
With that done, stretch more painter's tape across the astro turf to connect every even mark from one side to the other.
Step 6: More Marks
Use those marks on the top and bottom along with a measuring tape to quickly mark off the same four marks on the other horizontal pieces of tape.
Step 7: Spray Painting, Round 1
Step 8: Taping and Marking Again
With those in place, mark off every 18" on the top piece of tape and use that as a guide to mark off the rest of the pieces.
With that done, you can remove all the blue tape and let it dry.