So.
I just (and I mean literally), just thought of this.
What if you could choose a skin, ANY skin, from ANY website. Press some button that says something like 'Edits', or like 'similar skins', and it would find any skin that used the EXACT colours. Lets say if your skin was a fully shaded skin, for example this. (this is my skin btw =P)

And someone edited the skin, lets say, added a .. derp face to the chin, or added bigger, bolder 'cat ears' to her.
I could find the edit, due to the same colours being used.
The same shades of pink, white, brown, blue.
Even if there are edits, it would still show up.

(This also came to mind while writing it down.)
Also, what if it could go with main design. Like how this skin has a totally original 'drip sweater' design.
Similar skins would show up if it had the same pixels in the same place.
Now that I'm thinking of this I have no idea how it would work.
bUT STILL XD
EDIT :

(as
you can see, the three skins all have atleast one pixel of colour thats
exactly the same. The edited-skins search would work that way by
searching a pixel colour, or a couple pixels of colour, instead of
searching through the name of the skin, or the tags added to the skin. )
You can PM me if you have any questions.

Disclaimer : This is only an idea. There may or may not be websites like this.
(I have had people telling me there are some -they think- but I haven't seen anything like this, yet.)