Afaik, you get frozen items from phantom fragments(2.25k and 8k ones). And you get corrupted items from 5k and 25k shiny fragments gifts. Only problem is that shiny gifts aren't actual items but scrolls. So, you need 5 frozen items to get a corrupted item, which is at least 12.5k phantom fragments, too much to grind, at least for me.
I've only redeemed for three of them, but here's what I think they have: 8000 Phantom Fragments -Random preexisting rare with the "Frozen" in the title. 2250 Phantom Fragments -No clue, I haven't tried it yet, but probably an uncommon 25000 Shining Fragments -Random new inscribed rare with "Frozen" in the title. 5000 Shining Fragments -Recipe that requires 5 random "Frozen" items to produce a corrupted item
http://www.playdota.com/img/art/2858/fanart/f1244804694.jpg Crystal Maiden... gal could break your heart in a thousand pieces. -Rucks