I bought the G.E.B. 1 skin for Geb (the Transformer looking skin), and noticed it changes his X skill, the boulder morph, into a spaceship morph.
The spaceship version of it is definitely wider visually; but, it also seems to have a wider hit box, allowing you to hit more minions in a swath, or have a slightly tighter turning radius when chasing someone.
Are there any other player skins that modify skills to have a slightly different effect? Or do all of the premium (gem only) skins provide a benefit like this? I've only bought one so far.