When we moved into our home 6 years ago, there was a sad looking concrete birdbath smack-dab in the middle of the yard. It had a funny little squirrel "climbing" up the base. The top was cracked and would not hold water. I moved it into a flower garden we made, but it still looked bad.
I tried to patch it by spreading a concrete patching compound over the bowl but it failed miserably. I was left with a mess, but hated to get rid of the funky little birdbath
After pondering for a bit, I decided to make a planter out of it. After all, it did have good drainage - in fact, it didn't hold water at all! I planted 2 types of sedum, 1 type of rockfoil (red flowers), and 1 type of lithodora (blue flowers). All of the plants like full sun, little water and are perennials. I also tried to get a combination of spring and summer bloomers so that there would be seasonal interest all during the growing season.
It's nice to see the funky little birdbath functioning again - even if it's not hydrating our birds.