Den-O Zaku II - this is actually one of the entries for MG Zaku II Ver. 2.0 competition by Dengeki Hobby and was featured in July 2007.
Since Gundam Epyon was not featured in Endless Waltz, I suppose this heavy-mecha design is here to fulfill that role? ...
... or maybe it's this one?
The Titans' version of Zeta - the insect design from Gabthley is incorporated into the Wave Rider form...
Luckily they never get to produce anything like this XD
Ultimate Deep Striker make-over ^^;
Ultimate Hi-Nu Gundam make-over ^^;
Plenty of fan arts based on Turn A. The first one on the top left being the most "subtle" of them all, with changes made to the head only. In my opinion that gives this particular Turn A design a much more Gundam-like feel (which the original one lacks).
The other two are pretty much out of the Gundam universe.
SD Gundam Momotaro ver. XD
Not a Gundam, but I'll include him into this posting instead of creating a separate one: Tengen Toppa Gurren Lagann Five Star Story ver.!
Awesome mecha is just breathtaking O_O