I like the idea of bonuses for full armor sets. It could be something as simple as creating an elemental shield layer for the player. Each armour set would give you one of two options. Ex: VOG set would offer either solar or arc, CE set would offer solar or void, Shaxx set would offer Kenetic or Solar,... ect ect. The elements could change but you get the idea. Always giving players an option so we could be slightly different. Just make the bonus null and void in standard crucible matches for fairness. The trick would be keeping the shield layer from being too string I guess.