Using a mixture of chalk paint and wax, I gave my flower pots an aged patina. I was inspired to age my terracotta pots with paint after seeing At The Picket Fence's pretty pots!
Simply mix 1 tbsp of clear wax with 1 tbsp of white chalk paint. You don't have to use the brands pictured. I've tried this with chalk-like paint and wax purchased at the home improvement store and it worked just as well.
Dip the tips of your bristles in the mixture, then brush it on the terracotta pot.
Let it dry for about 30 minutes, then lightly sand the pot with 220 grit sandpaper.