I made the mistake of evolving a Shiny Eevee into Jolteon, don't unless you want an ugly Jolteon. It's some nasty green color, looks like phlegm sort of.Shiny Ninetales !! Silvery grey / blue suits ninetales SO much in my opinion, it just looks beautiful. Shiny Eevee is really cool too though - think of the evolution possibilities :P
Currently soft reseting for a shiny articuno in SS at the moment. One day xD