This is a file that cross references each tile by terrain card number. I then file my tiles in order, with the lowest card side facing forward and the back side ordered by ascending card number.
For example: knowing that Forest (Card #3), Hedgerow (Card #4), Hills (Card #6)
I would place all of the Forest/Hedgerow and Forest/Hills tiles together with the forest facing forward. Then the first tiles would be the Forest/Hedgerow (because its card number is less than the hills).
I would have no Hedgerow tiles facing forward unless they were combined with another side with a higher number (ex. Hedgerow/Hills which does occur).
After organizing them in a box, I print this sheet and leave it in the box. I find getting the tiles and setting up the board is halved at least, probably more. Especially as more expansion come in.
I stopped collecting at Winter Wars, so have nothing from that point on, but I think my collection is complete up until that point.