Well, I've probably gained another 100 hours of gameplay since the last time I was moaning about never having had a shiny... and I've still not seen one. I reckon they don't really exist and everyone's just having me on...
Assuming they're not a figment of everyone's imagination, I'd rather like a shiny Ditto, Ninetales, Rapidash, Eevee, Houndoom, Mightyena and Gardevoir. Blue Ditto is my favourite shade of blue, and looks just perfect. Shiny Ninetales is a beautiful shade of grey/lilac.
I quite like shiny Togepi, but the change is so non-obvious you'd have to point it out to everyone, which would rather negate the whole point of having a shiny...
Other Pokemon I think look cool in alternate colours are Sandslash (red spikes), Lickitung (peach body shows off his tongue better), Chansey (with subtle green bits), Psyduck (cute!), Diglett/Dugtrio, Unown and Wailord (lilac). Pineco is cool in proper pine cone brown, but nasty as as brown Forretress (or maybe Forretress is just nasty anyway).
Some of those sprites are pretty disturbing. Especially the pink ones - there are pkmn that should be pink, and Kyogre is not one of them! Pink Golbat, Jumpluff, Wobbuffet and Heracross are all incredibly wrong, and shiny Nidoqueen's pink "bikini" HURTS MY EYES. Shiny Gloom, Vileplume, Bellsprout, Weepinbell, Victreebel, Exeggutor and Sunflora all look sick (plants aren't supposed to be that colour!). Green Teddiursa is WRONG WRONG WRONG, as are purple Swampert (I like purple, but on Swampert?), blue Pinsir (eeeek) and multicoloured Carvanha (actually quite cool, but somewhat scary).
To be honest, though, I'd just be pleased if I managed to see a shiny, let alone catch one. Even if it was a Wobbuffet. I'd just have to devise a whole new battle plan to intimidate my enemy to death with the PINKNESS.