This idea just popped into my head so I threw it together to see if it was doable. I'm not sure if this is allowed/counts as modifying the HA though, or if it's already been done. I'd love to get some feedback on these.
There is subtle highlighting to indicate plastic-like skin which really only shows up on darker skin tones. And I know that most BJDs don't have knee joints like that, but I thought it looked pretty cool so I put it in, haha.
I'm not too fond of the black lines, but I'm not sure if I would be allowed to change their colour in this case.

Thoughts? o:
Someone tried to make a metal arm and it got rejected because it was considered altering the HA. I think that'll be the case here too, honestly. : I do love the idea though, really do. I love the tummy part(especially on the darker HAs)
Aww crap D: Well, at least I suppose I can try to use it as a tattoo, haha.
Good luck. I am not sure if you could but it never hurts to try ^^
Hmm, I really like the idea :) Maybe you could write to the staff and ask if working on this would be wasted or not?
I might! But the thing is, I think it'd be seen as more like a skin than an actual wearable item =/ I'm thinking of just splitting them up into sections and putting them up as freebie tattoos.
Freebie tattoos? How'd that go? (And sorry, but I think, you layered your top above your chicken.)
Oh lol I did! I'll go fix it now haha.
And I haven't tried it yet, but I'll probably post a link to it in this thread when I do!