What can I do with these Terra-cotta pots?

Site has tons of ideas for you

They can be painted or decoupage then used as holders for jewellery, paper clips, elastics, makeup items, pins,

Turn them upside-down, and make a pyramid design. Get some fake flowers, and stick them in the holes at the top of the pot. There are only a few holes, so paint the pots with flower design.

You can paint them and turn them upside down, run some wire though them and hang on an upside down tomato cage for for accent in your garden.

Donate them to a local elementary school, especially one in a less advantaged neighbourhood. Growing small plants, or germinating seeds, is a learning activity that many teachers would welcome for their students, but unfortunately, there often is just no budget for these kinds of materials.

The kids could paint their own designs on the pots.

You could drill holes in the bottoms and put string lights through for a garden themed garland. They could be painted to match your outside furniture.