What you need:
glitter glue (or any other decorations)
What you do:
Paint the clay pot however you wish. Let it dry.
Attach glitter, stickers etc. Let dry.
Seal with Modge Podge or a similar product (can be found at any craft store).
We planted cactuses because they are very easy to grow (and our cats won't eat them). Many varieties are out now that are not prickly.
Naming them was a nice touch. The children are still talking to them and watching the new sprouts.