Sightstone suggestion
+ 300 GP = 
, takes up trinket slot
Stats: 3 charges max, 1 ward lasts 180 seconds per normal. Charges fill at the rate of 1/60 seconds and refill completely on returning to base.
Purpose: gives everyone a chance to buy a sightstone so vision isn't the support only thing. It uses a trinket slot specifically so people won't worry about losing a full build or have to give up warding late game. Made cheaper for supports at the cost of no health. They can spend that saved money on a health item.
New ward functionality (for all wards): danger pings the map whenever it detects an enemy champion, 10 second CD. The goal of this functionality is to encourage people to look at the map via an ingame method.
So a better version of this? I wouldn't mind, but I really think they just need to make sighstone better by giving more choices for stats (such as AP, mana regen, etc.) and then make the wards recharge while roaming since that's the biggest issue right now. SS you have to back every so often, Yellow Trinket not so much (I some times roam for well over 6 minutes. Sightstone simply does not last that long, while Yellow trinket does.)