10” black plastic saucer
An extremely sturdy 10" black plastic saucer is perfect for placing under plant pots to contain any drips after watering. There are small raised feet on the bottom, which keeps the saucer from sitting flat on a surface and protects whatever is underneath. The black color goes with any décor and will fade into the background unnoticed.
It's just shy of 1.5" deep, so could also be filled with pebbled or glass marbles or beads (glass is easier to clean), and used as a small humidity tray.