I thought I'd start a thread to show off and talk about my little Lego creations for Mobile Frame Zero, since others have done the same here. And besides, it's not like these creations can't be used in BrikWars anyways.
Here's my first complete Frame Company: The Bright Seraphim, a United Mars Foreign Legion Company who, after a long tour of duty, have an eclectic mix of UMFL-standard Frames and modified labour Frames.
Here's a group shot of the company in the field:

An ST-07 Chub:

A modified Chub:

I'm not entirely satisfied with this frame. I think I'm going to rebuild it as a regular ST-07 and use those arms on another frame.
A couple of Conscripts:


These are actually the first two frames I ever made, repeatedly modified over the years. These date back to the "Mechaton" era, and I'll probably be modifying them again, maybe into Commissars.
And finally, four Space Marines:


These guys also date back to "Mechaton" and they've been pretty heavily modified since I first built them, I think they may each have six parts in common with their original builds now. These guys are a little small compared to most frames, but I love the design. I'm tempted to start calling them "Power Armours" (because of the inspiration for their current form) and treat each pair as a single Frame.