The legendary workshop thread in the official website is now open to allow folk from the community to post their ideas.
I've posted one myself which I think is something that'd come in handy :
http://us.battle.net/d3/en/forum/topic/ ... ?page=4#73
This ones pretty straightforward but rather useful for everybody.
Elemental Ring of Conversion
Converts all *Elemental* to *Elemental*
(where *Elemental can be Arcane,Cold,Lightning,Fire,Holy and Physical)
One main stat
*Elemental* skill deal 15%-20% more damage
+ 3 Random stats