I got the 10 inch marcus the other day at Toys 'r' us for $7, and I really didn't like the way he had no blood. Marcus in the movie didn't have a lot of blood showing either, but there should have been considering he was a true cyborg (and especially because the flesh was violently ripped off of his body!). So I made mine look like the way I wanted it to.

Whole body


Upper body closeup

Head

Back damage

Feet

Hydrobot's eye sensors painted red
I really like it now. I think it was a good deal for only $7. I just wish the hydrobot was more of a blackish color. I don't know if I'll completely repaint mine, though.
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Here's a diorama I did in my backyard ...

... of two T-600's patrolling near a downed HK.
More to come!