I think this is an awesome idea. I heard that any skin could be in it. If I get Pax TF I swear I will make a pilgrimage once a year to Riot HQ and bow on their front lawn and weep over the luck I have been bestowed. Anyone here hoping for a particular skin?
From the Mystery Gift FAQ:
A skin for any Champion that your friend owns is eligible for Mystery Gifting, as long as it's worth at least 520 RP and is available in the store. This includes Legendary and even Ultimate skins! Legacy skins will also be obtainable as a Mystery Skin EXCEPT Achievement skins, Collector's Edition skins, PAX skins, Rusty Blitzcrank, Urf the Manatee, Championship Riven and Riot Squad Singed.
Sorry. D:
They said you have to have at least ten skins you don't own. Who knows, you might get TEN free skins! j/k lol
You can't get Pax skins from Mystery Gifts. So that won't happen sorry.
Totally hoping for Void Fizz :D
Any skin, really. I'm just happy that riot has decided to reward the positive players!
Poro Rider 
:)
NO! why? Because we got no lifetime rp rewards.
First reward the people who supported the game and the company!
Spirit guard udyr or project yasuo wouldnt be bad at all :P
just any skin for a champion i will actually use and pref that i dont already have one for
It's any available skin in the store that's 520 RP or higher. I won't be getting one, but if I was I'd want Shurima Zilean so bad.
Hoping for a skin for a champion I'm more likely to use, especially if it's one I like better than their base (a lot of the reason I don't buy many skins is because I really like the base of most of my played champions. I bought rocket girl Tristana before they announced her VU and changed her splash art and I'm so insanely torn right now...)
Great Idea!
Pulsefire 
or Spirit Guard 
, due to the fact that I will never in my lifetime pay that much for a skin... Probably.
Otherwise, I have always loved the battlecast line, so one of those would be great.
Really any skin ?? When did they say that PAX skins were a possibility in it ?? I must know if this is true !!!
Dragonslayer Pantheon, Soulstealer Vladimir, Battlecast Cho'Gath, Blade Queen Lissandra, Gatekeeper Galio, Hazmat Heimerdinger, Blood Moon Thresh (if it's available then), Final Boss Veigar.
I'd be really happy getting any of those, but honestly getting any skin for free is pretty nice.
