I made these blight drones out of green stuff over a few evenings. I figured that daemon engines like these would look fine if they weren't perfectly uniform, so were a reasonable choice for a scratch built formation where my inability to make them look exactly the same wouldn't matter.
The base is simply a 25mm washer and a paperclip, with a scattering of sand.
A quick paint job, but they will do the job. I tried to make them distinctly non-death guardy as they were never anything that was in the legion so made them rusty brown rather than off white. Unfortunately I stupidly applied a brown wash after I had painted all of the rusty patches onto it, which dulled them right down again and made them look a bit bland overall. I will have to add a little more orange and yellow back on to get the effect back that I'm after.
So that's it for now; another unit emerges from the warp!