There is already a lot of space for blue and yellow augments on cloth (including armors) and jewelry.
Red is available on weapons and orbs, but why not on shields?
Shield can be used as a weapon (which I guess is not popular except chance for secondary bash), but has potential as spell power supplement for classes that use red for damage in main weapon (druid, cleric, favored soul, all with multiple elements plus devotion).
Rings can be equipped in two slots and have potential as spell power supplement for classes that use two handed weapons, so could appear with all augment variants.
Red is available on weapons and orbs, but why not on shields?
Shield can be used as a weapon (which I guess is not popular except chance for secondary bash), but has potential as spell power supplement for classes that use red for damage in main weapon (druid, cleric, favored soul, all with multiple elements plus devotion).
Rings can be equipped in two slots and have potential as spell power supplement for classes that use two handed weapons, so could appear with all augment variants.