kaljukajakas said:You can make your own "spin out" paint rather easily. Take some copper sulphate (the blue crystals at gardening stores), dissolve a bunch in water and then add a bunch of baking soda and mix. You'll get a light green precipitate that's an insoluble copper compound. Filter it (wash the precipitate in the filter with plenty of water to get rid of any soluble salts) and dry in an oven and grind it into an inpalpable dust.
The next step is to get some sticky latex or other "breathable" exterior paint and mix in some of the powder you just made. 10-20% of powder would probably be the ballpark, you don't want too much or the paint will be too thick to apply. Then take a brush and apply it to the inside of your pots. You might want to roughen the interior of the pots with 100-grit sandpaper beforehand to improve adhesion. Even so, If you have PP or HDPE pots the paint won't stick too well and will flake off eventually if you kick the pots around too much.