For those unfamiliar, Shiny Pokémon are alternate colorations of regular Pokémon that have an astounding 1 in 8196 chance of appearing. Their colors range from the unnoticeable, such as Pikachu merely being a slightly darker shade of yellow, to incredibly different, such as Charizard having black skin instead of orange.
Metagross, in my opinion, has the coolest Shiny colors of all the Pokémon. I saw the Battle Frontier Deluxe Metagross figure at an FYE, on sale luckily, and had the inspiration for this paint job immediately.
Shiny Metagross Custom by ~GodofPH on deviantART