Nice find.
Since Runes are not transferable, they are either card locked or user specific. If user specific, it's wildly random or from a set number generated. I find it hard to believe it's totally generated from all cards. Imagine your 31 cards being mostly high end cards.
So here's my thought. If you have multiple runes, post them here and keep it updated. My theory is this. Some of us may be, intertwined. For example, if someone and myself could find out we both have Troy Daniels runed. If thats the case, why not tryout the other runes each other has. If someone has more than one mutual rune? That would get interesting.
EDIT: Knowing the actual rune's correspondence on the card is a key too. There is a photo with each rune on 2kHead that should work. Going left to right starting at the top you can give it a number.
My runes;
Dwight Howard
Trevor Ariza (Rune - 1)
Troy Daniels
Nik Stauskas
R.J. Hunter (Rune - 11)
(Need to check on the other runes numbers when I get home)