For portraits:
/run local function Flip(self)self:SetTexCoord(1, 0, 0, 1) end hooksecurefunc("SetPortraitTexture", function()Flip(PlayerPortrait) for i=1, 4 do Flip(_G["PartyMemberFrame"..i.."Portrait"]) end end) SetPortraitTexture(PlayerPortrait, "player")
Edited to stop it flipping back.
(they never remeber DUF 
)