No ideas but very cool find!

Beautiful! Moving water, bell fountain, would prevent mosquitoes or if it is still water--lotus or mini waterlily you could use mosquito dunks or 2 feeder goldfish. If you are interested in painting it I have used spray paint on a wet sponge to give a sponge painting affect to some concrete things and it turns out great and is lasting. Great find!

How do I figure out what kind of pump I need, preferable solar, to keep the water moving?

How many gallons is in the container? Most pumps are rated as _gallons per hour. If it is just to stir the water you just need a little pump and not worry about GPH. Inexpensive $16 dollar solar pumps can be bought at Harbor Freight and Walmart. (Read reviews) They will not run on overcast days or nights. You can spend more and get a battery back up that is charged by solar power and continues to run for a while at night or on cloudy days. Google "best solar pumps" for more info. It will make a pretty little water garden.

I will try to post a photo of what I do with it. Thanks!

Wow I can't believe that was at the dump and now i'm jealous that we don't have a "last chance" store. That thing is gorgeous!

That is a wonderful pot!!! Fountain would be great.

Wonder why anyone would throw it away???

We don't have that type of store at our landfill either.

If it's turned upside down it would make a wonderful pedestal for a nice big pot or for a statue or yard art.