Just the one that came with the mercenary edition and I see no reason for that to change soon because:
1) I mostly fly an ASP which has no skin
2) I cannot see the skip from inside the ship, and by this I mean they are not implemented yet as if I look to the side on my Eagle I see a "grey skin" (actually, just no skin at all) instead of the one I applied.
So once they change that I'll think about it.