I would like to see a new bundle item that allows a player to select two different schools and receive a specialized piece of gear that supports both schools. So, I could select Life and Storm, and receive one hat, or one robe, or one wand, or one set of boots that has stats boosting both schools. Items could be level tiered, just like other bundle gear items, and maybe feature the embossed school patterns on them.
Very important: these multi-school items shouldn't ignore or leave out stats that players need, like universal resistance, critical block, pierce, as well as damage, accuracy, and, and critical boosts. We see that way too much with the current craft and card pack gear sets, and it makes the gear impractical. That's why so few people mix and match gear as it is--doing so makes you ridiculously weak compared to your "school only" sets.
This addition would boost Mastery Amulet sales, it would make PvE more exciting, and would make PvP less repetitive and tanky.