Textures: Is it possible to allow for texture changes? What I mean is to change it to "flat" as most of my addons are set up. Sorry I am not a native english speaker so that may be asked in a confusing way. (Probably it is protected by Blizzard or something).

I second this motion, I would love to have a choice of textures on the frames as well

I was looking for this too.

I will try to accommodate this, but I can only do so much on the stock frames. If it's within the realm of possibility without getting extremely hacky then I'll try to make it happen. No promises though.

Did you ever look into replacing the default texture?

Seems simple enough,
line 159 erf.lua:
frame.healthBar:SetStatusBarTexture(texture)