I'm not a fan of shinies that aren't really that different from their normal color. Seems kind of pointless. Like Pikachu or Garchomp.
Likewise. However, the concept of shiny Reshiram was quite interesting, golden rings. I dislike Gabite and Garchomp's shiny formes in particular, as Gible had a very cute shiny appearance. I think it is OK not to go that far off-colour unless the pre-evo had.