Put in bottom of large clay plant pots to drain water
use them as borders for a garden
Paint them different colors and try to glue it back together into a whole new looking pot.
I like to use them in my potted plants,to cover the dirt.Frogs love to get in my plants,they dig holes and are pretty covered up.Then when I am going to work on a plants the damned things jump out at me and scare the crap out of me.Thats why I use rocks(which I collect)or pieces of broken pots,whatever, to cover the dirt in the pots that I keep lower to the ground.The higher potted plants,I don't have to worry about frogs trying to keep cool!!
Put them into special places in your garden, and have herbs growing in them and spilling out of them....
Shape them into a left eye, nose and mouth. ;-)
Sell them on eBay.
Just how broken are they.....If they are just cracked....Or a piece or two...Then you can drill small holes in them...and wire then together...But if it is really broken...as in shattered...Well glue them together.with water proof glue...and use them as a cover for plastic pots...Just slip it in
If you have enough you can crush them and make a red gravel-like stepping path through your garden.
Breake them into smaller pieces and put them in the bottom of other pots just the same as you would rocks. It helps with drainage and helps prevent root rot.
bury them in the garden and use what you can to hold water,minerals
Let the little man paint them and sell them at his first art showing.
Crush them and make sand. ;)