Favorite Skins So Far?

After purchasing and working toward various crates and disenchanting random skins, I was finally able to unlock a Mecha Zero Sion skin and the moment I experimented with this skin in PVP I was not disappointed. With a more dramatic (albeit admittedly comical) death animation, menacing new lines, a badass propelled hammer in place of an axe (why no hammeraxe?) and the ability to turn into a jet-propelled train while using my ult, I was able to enjoy steamrolling Teemo at Top lane more than I normally would have with the standard Sion skin. So with the desire to add some positivity, I'm asking you the reader: What are some of the best skins you've seen for any characters so far?