M. Frary & Anthony, you have the tea party with crumpets first and then you ruin the tea cups after
Wire on some of them would be an issue. Maybe making a circle on the bottom, with the wire, could fix this. Half of these had a small lip on the bottom so wire should fit fine on those.
These are also small enough to where they would be placed half way down into a tray filled with pebbles. Would illuminate any wire issue, water/air issue, help to keep them stable, and keep soil damp longer (I think).
BadgerBadger, Soaking the pots? Interesting idea. I will have to test that next time.
defra, Nice idea with gluing small smashed pot bits to the bottoms. Or big bits to make them look very silly.