A simple paint technique with great result, and lots of possibilities to vary on the theme.
I wanted a flowerpot against the facade of my house, matching the mosaic the previous house owner glued to the wall. As you can see the mosaic tiles are dark blue, and there aren't many blue flowerpots. So I bought a straightforward grey clay-fiber pot and pimped it
Mixing some outdoor black wallpaint with artists acrylic in blue and green I achieved a nice dark blue color matching the tiles on the facade wall. I did not mix it quite thoroughly, so the paint result doesn't look flat, but shows some variation. Paint a few inches on the inside of the rim as it, may be, can be seen after planting.