[Fizzlemizz]

The TalentUI is Load On Demand (the frames and code don't get loaded until you press N or click the talent menu)

local f = CreateFrame("Frame")
f:RegisterEvent("ADDON_LOADED")
f:SetScript("OnEvent", function(self, event, name)
    if name == "Blizzard_TalentUI" then
        for i, v in pairs({ PlayerTalentFrameTopBorder, PlayerTalentFrameRightBorder, PlayerTalentFrameLeftBorder, PlayerTalentFrameBottomBorder, PlayerTalentFrameBtnCornerLeft, PlayerTalentFrameBtnCornerRight }) do 
            v:SetVertexColor(.1, .1, .1) 
        end
    end
end)