The one and only shiny I've ever obtained in a pokemon game (with the exception of the free shiny at Lake of Rage) is my shiny Larvitar =D His IVs are meh, but green is my favorite color. He's sitting in a PC box at the moment.
A Shiny Weepinbell I got in a horde. I replaced Gloom with this as my horde summoner, as it just learned Sweet Scent. It's Adamant nature too, so I can probably make it into a decent physical attacker. I will probably evolve it pretty soon.
Definitely one of the more useful Shinies I've gotten over the years.
I caught a shiny tentacruel in soul silver... it should still be in a box somewhere. Before that it was a shiny golbat in the original silver version... literally... I've found 2 shinies besides the scripted gyrados.