What to do with paint tester pots?

[JamMakingWannaBe]

Having used 0.0001% of my B&Q Valspar tester pots (at £4.25 each!) to paint an A3-Ish sized piece of lining paper to test the colour in the room, what do I do with the remainder of the paint? It just seems so wasteful.
Why can't B&Q/Valspar sell A3 sized paint cards?

Use to paint plant pots or photo frames.

Put then on Facebook for free, someone will take them off your hands. Even if only for kids painting.

It annoys me so much that these are so big. I must have ten in my garage.

Sorry can’t help with suggestions! In my case it’s store in garage until you move house then chuck them.