Use for plastic Lids
What size are the lids?
There are lots of ideas on Pinterest.
Here is a list of 40 ideas! https://www.onegoodthingbyjillee.com/40-clever-ways-to-reuse-plastic-lids/
Here are some fun garden art ideas.
If they are patterned/textured you could use them as a printing block, all my spare lids always end up plain and boring but I have seen beautiful prints done with lids.