Crankcase by Hammerstein NWC. I've featured his work before.
This one may be a tad tall for MFZ but it sure is interesting.
W5-252 Combat Drone - Heavy Weapons Variant by MinifigGuy.
I'm not too thrilled by the ankle connections, but the rest
of it looks solid. It also can't be downloaded.
"Kobold" Drone by Garry_Rocks. Render. There are some
brilliant techniques here. It's unfortunate we'll never see
this one "in the brick", 'cause this thing is a beast.
Puddle Jumper by Nick Royer. These look fantastic. They also have instructions.
RCI MM-G2 by art_xxx13. A simple, straightforward build with just
enough articulation. A squad of these on a table would be great.