You could wash them to remove as much of a garlic smell as possible then cut stencils out of them.

You can make printing plates from them. Press your design into them with a biro or pencil then ink/paint them up and print away! I’ve also used joss sticks to burn patterns into them and then use to print. If you’re into arty things you could also cut them up and use as ATCs (Artist Trading Cards).

If you can wash them and remove the garlic smell, can you re-use the base as a cake holder? Maybe it can be used for putting underneath the pots to soak up more water…

Could you use them as disposible plates for a picnic or camping holiday.
I know it is slighly wastefull but they have had 2 uses out of them then.
also usefull to make less to take home afterwards.

or a stand for pot plants.
or to line waste bins to stop the yukky tissues sticking to the bottom.
or if you can get rid of the smell place mats or cut into coasters???

Find your local Art Centre or some charity art group. I am an artist and I think these would make a rather unusual and funky canvas for oil/acrylic paintings! Also - if you collect these in different shapes and colours - you can stick the smaller ones on the top of the big ones and make a funky wall decorations - who needs wallpaper!

you could get yarn and a fat needle to sew through the foam nd make art out of it

When my little sister was learning to tell the time, I made a pretend clock for her out of a pizza base. Perhaps your local school could get their children to make clocks, or they could use them in arts and craft.

you can use them as table mats or maybe cool wall decorations

Cut a circle in the middle . Use the brim for Halloween hat.
All you have to do is to add a paper or fabric cone on top.

Turn it into a picture of a ball. Good for boy’s room.

Use for working with clay.

Cut out the brim, decorate as a wreath.

Cut out the silhouettes, hang on a wall.