These are the cheapest little planters I could come up with.
What you'll need:
-Tins --> Any kind, any size. Just make sure there are no rough edges. (If there were, you can always flat them down with a hammer)
-Screwdriver or any pointy tool
-Spray paint --> I used the colors I had at home
1) Get your used, washed tins, flip'em upside down, and hammer down your screwdriver to make some holes in the bottom.
Make a couple of holes. Good drainage is always appreciated by your plants!
2) Spray paint them. It needn't be perfect. Just cover the tins a bit here and there.
Remember to protect your home surfaces with newspapers or plastic. Spray paint is not easy to get rid of.
Gloves come in handy as well!
3) Let them dry for a couple of hours
4) Fill them up with soil and start planting!
Note: These are not permanent planters, but they get the job done if you're in need of a quick, cheap, esy solution!