Okay, This is just a nice shaded, High visibility skin,

Example for good use:
So, you're on a survival multiplayer server, you're following your friend through a jungle biome and keep getting lost,
but now, if you both have this skin, then you will be able to see each other easier!

There is another version of this skin at www.planetminecraft.com/skin/high-contrast-and-blocky/
Diamond would be nice!