Most of my online names tend to follow a jewel and elemental theme:

FlamingRuby (and its newer version FireRuby)
EmeraldSky (a reference to Pokemon Emerald)
IcySapphire
LightningTopaz
GaiaEmerald
ShineDiamond
WavePearl
StormyAmethyst (my newest one)

Some other ones I remember are EternalSky and Pokemistress Sapphire