Here's a few more mecha I found by looking through Flickr.
RIPPER Prototype by Ryan Kessler.
Kinda reminds me of a Predator.
Orange by Color!
Great personality in a small package.
Draco by Mitch.
An excellent use of color, and the parts use for the main torso is very cool.
Magni by ZephyrChaos.
A bit of Zizy-ness.
Combat Bot by Jǝns. Kinda old school and blocky. Another case of not allowing downloads.