What you'll need:
-A large can or metal pail
-A similar looking back-splash (or a bunch of small rocks if you want to make it difficult)
-Mixing cup or bowl (will probably get ruined so I suggest a takeout cup)
-Paint mixing stick
What you need to do:
First off, you will need to apply the tile adhesive to the large metal bucket/can/pail/etc that you chose, using your putty knife. Before you allow the adhesive to dry, either attach the back-splash you chose (or the stones that you picked out) around the soon-to-be flower pot. If you are using stones instead of a back-splash, make sure you choose a pattern you like and space them about 1/4 of an inch apart or just make sure there are gaps between them for the next step.
Once your back-splash or stones are on and your tile adhesive is dried, you need to follow the directions on your non-sanded grout. Once the grout is ready, use a clean putty knife to apply it over the back-splash or stones(jeeze that seems repetitive!) make sure you have an even layer of grout around the flower pot and that there are no gaps. Refer to the grout's directions on when to use your damp sponge to clean off the access grout from the surface.
Once you are done cleaning the access grout, let the grout dry completely. After it's dry, I suggest drilling a hole in the bottom of the pot to allow extra water to run out as to not drown your plant. Once this is done, put in soil and a plant and viola! You now have a beautiful flower pot!