I wonder what my mystery skin will be if i own all the champions.

Like i own all the champions so i will be receiving a mystery skin. i wonder if it will be like a cheap 450 skin or it will truly be randomized. cause if i get a like the cheapest skin in the game i know something is up. but i guess we will find out 7/1/2015. comment on here your thoughts, what skin you would like to most receive, and if you think riot will truly be fair about the situation. please 1 up this listing. i wanna know what you guys think.