"How did you get the Dreamblade fig off it's base? And is it?"
Dreamblade bases come in two pieces, the colored plastic, and the black square that are part of the figures. It's still got the black base which has "feet" on the corneres which I figured would work good on a statue. As for getting it off... sprue cutters, a needle nose plier, and a bit of time.

There are some that I'm just puttying over to look like stonework, at least most of the figures I want off of the bases have thin connecting places.

"Roughly what scale/size are the pieces?"
If you have a head for estimating sizes, the outer bases are just under 40mm. Almost all of the human figures are 40mm, and the average figure (all, not just humans) is between 35mm and 50mm tall. And there are some that are bigger than that. If you have a particular one in mind I might be able to measure it for you. Though I don't really have anywhere close to a complete set.
"Any hint how you've done it?"
I started off with a blue-green color from Americana called Bluegrass Green, then heavily drybrushed a mix of that and white to make a kind of mint color. Then another heavy drybrush of bronze, then a light one of silver getting in especially large flat surfaces that might get alot of wear. Like on the edges and the head.
Most of the rest of it is going back and doing thin green washes, and bronze and silver dry brushes to fine tune the look. There were places where the metallic had gotten too much in the grooves, so i mixed up some white/green and worked a little in the cracks wiping it off the surface detail with my finger. I also painted the green into deeper areas like the plates in the rear, between leg sections, and under the shell to add more definition. I also darkened the eyes with watered down black.
Maybe I'll do a step by step for the next one when I find it again.
Thanks for your comments.