Here's a cute ballpoint from Tokyo Pen Shop, the Pilot Prismee Ballpoint with a 0.7m tip. I loved the beautiful jewel-like colors, and chose a clear blue sapphire to try out. The pen clip pushes down the ink cartridge and there is a side release to retract it.
As far as ballpoints go it's a nice writing pen, definitely looks good, and the colors are pretty. The only drawback is that it cannot be refilled. In the age of recycling, I can't believe Pilot couldn't find a way to make this refillable.
As much as I love the design, I'm not planning on buying a replacement when this one is finished. But that won't be for some time, so I'll enjoy the Prismee while the ink lasts.