Hi Michelle: Here are a couple of sites that tell you just how to do that:
Hi Michelle. I would like to share a great resource with you. If you ever want to see old projects here on Home Talk, click on the little blue house at the top of this page, left-hand corner. Also, check out "Explore Projects" for even more. Good luck Michelle.
The cutest jean planter I have seen is the top with the legs cut off and dipped in quickrete cement and left to dry. They should be made to dry so they stand up right and the bottom closed so it will hold dirt. Then paint it a denim color. Good luck and if you do it, be sure to show us a photo, Michelle!