Changing Planetary Textures

[spinomonkey]

I'm not much of a modder (graphic designer by trade). How would I go about swapping out existing textures for my own? Namely I'm looking to alter the planet textures to something a bit more exciting. I've dug through the root files but I'm not finding them- I imagine they're packed inside a compressed file? I'm not sure where to begin. A little help/advice would be awesome of you guys-

Thanks-

[somnambulist]

Everything you need to know:

http://forum.kerbalspaceprogram.com/threads/107471-0-90-TextureReplacer-2-1-2-new-thread-the-old-one-is-broken