PixelButtsさんのイラストまとめ

Also note that her ult is literally 2 different models stacked on top of each other.
Her data layout has some very all over the place dependencies and I'm genuinely surprised they shipped it in such a messy way

oh and to make it worse its a combination of her in-dev name and final name, so finding anything is just going to be awful

Orianna's ball used to have arms i guess. the second image is whats in game right now. no arms.

Once we get through redoing the base model renders for the wiki I will be doing unreleased renders as well. Some examples can be seen below for unused textures.

Black Alistar (black alistar is black/red not black/white)
Caitlyn (blue hair/makeup)
Gragas
XinZhao (subtle changes)

Udyr as he released, with Black Belt Udyr and an unreleased skin concept named "Red_Karate" presumably based on Ken from Street Fighter

More interesting trivia
Rusty Blitzcrank - the rarest skin in League of Legends (do not argue with me on this) had 2 main iterations
Left: October 10 2009
Right: June 7 2010

I have never seen any footage of the one on the left, but the loadscreen/splash art shows this one

For the record, I'm posting these renders because I've been asked to make them for the league of legends wikia, since I have the most accessible amount of old data.
There's too much data.

Dark Crusader Mordekaiser
SKT T1 Sivir
Taric Alternate
Exterminator Twitch

Shield your eyes for this one

Sivir
The first one is from the investor demo called "Onslaught". We don't know it's date.
October 18, 2009 (was used prior to this too)
October 20, 2010 (first major texture update)
May 25, 2013 (Model Rework)

Gangplank
March 2009
October 2009
November 2011
July 2015 (also event exclusive)

0.0.0.37's patch data only shipped a small change to kayles stats and this texture which was then not used in 0.0.0.40 patch. the old data was still there but removed later but its still interesting