Okay... let's see how many planet names I remember from XG2...

Aquanor - A watery planet, generally dominated by oceans. About 15% of the planet's exterior surface is land. Somewhat industrialized; you can always see a crane or something in action in the distance.
Sensara - The ruins planet. Some species had colonized this planet years back, but now they've apparently abandoned it. Buildings are still generally standing, but now they're overrun by moss and plantlife.
Farron - Imagine a world where the flowers are twenty stories tall, and you've got Farron. Apart from the normal-looking grass, the plants are enormous. Luckily there's no atmosphere-scraping trees.
Lumania - A lush planet, covered in grassy plains, and blanketed by a soft blue sky. Several small buildings project a narrow cone of blue energy some meters into the air, giving light at night and generally being aesthetically attractive all the time.
Meza Virs - The jungle planet. Sunlight is hardly visible through the thick cover of the foliage, but the planet is still swelteringly hot. Surprisingly, there are a few cities on the planet built by those who can stand the heat.
Canous - A snowy, mountainous planet, where there's always a blizzard within a kilometer of your position. Needless to say, it's very cold here; thanks to the mountainous crags, it's also difficult to traverse the surface of the planet without falling somewhere.
Tethra - A planet covered in desert. Anywhere you look, there's harsh orange sand everywhere around you. There are some large stone figures scattered around the planet, and there's one large, main city, with the only source of water on Tethra.
Anville - This planet is completely industrialized. It's hard to look in any direction and not find a tall structure looming back at you. The air is chokingly smoggy, and the sky is a deathly maroon, but the ground (artificial, of course) is warm to the touch.
Hydra Prime - A big ball of water. Several structures have been built under the surface of the planet-wide ocean, and despite its inundation it has been well-colonized. From any of the structures you can look out of the glass walls and observe the aquatic life.
Cordilon - The most lethal planet of the bunch. This planet's high cliffs serve purpose to several deaths, accidental or otherwise, and the burning sulphur lakes don't help much. However, there are those who are brave enough to try to colonize the planet.