if you've been hanging around GPX lately, you'd know that there's a new feature - custom skins!
They're pretty nifty and you can enable them by using the Settings tab under your Poketch. You need valid 6 digit hexidecimal colour codes; I recommend Photoshop, but if you don't have it http://html-color-codes.info gets the job done too.
And if you have tried this feature out, why don't you show us what you've done here? c:
I've made a couple myself, and I've included the colour codes as well.
Heat and Clockwork (Shiny Charizard)
Wrath and Angels
Frost and Frogs (Pendulum)
Wind and Shade