Gold income

Patch 3.14 introduced new passive called gold income that restricts champions access to passive gold gain by allowing champion to carry only one item at any given time with the passive. Items having the passive supersede most of the gold per 10 items and it can be found from nine items that can be grouped in to three different colors (or groups or families) based on their gold generating features. Unlike the old G/10 items these items allow their user to engage into the game lot more or even demands it.

Note that the advanced items have the same gold generating abilities as the legendary ones.

Gold per 10 seconds
Depending what the champion is doing with the each of the items their gold generations varies a lot, from zero to as high as 84 gold per 10 secs.

Yellow Favor items need least effort from its user as the user only needs to hang around the lane. They reward from watching minion waves die, are the least profitable and punish the most from leaving the lane. In a sense these are the old school style G/10 items where support can focus on looking out for ganks, healing or simply dancing.

Green Spoils of War (SoW for short) items are the other extreme where the user needs also take part in the minion killing. They reward from sticking together while farming and give nothing when soloing. They are also the only gold generating items that scale with minions value. Best suited for those that gain additionally something than just gold from killing minions or a duo that likes to stick together.

Blue Tribute items are the only group where a enemy champion affects the gold generation dramatically and minions are just on the way. They reward from active harassing and punishes the user the most from killing a minion. Also the most difficult item group to maximize its potential as for its maximum potential five enemy champion needs to be damaged with a ability and a auto attack every 10 seconds without killing any minions.

Duo
A duo combining these items generate even more gold but different combinations have remarkably different outcome.

Having double Favor (or ) does not increases the waves value in any way thus only benefit is the additional 2 G/10 making it the worst combo. Second worst is Tribute+Favor (or ) as the items punish both users from killing minions. Third worst is the Tribute+Tribute (or ) combo that is the most powerful G/10 combo for a duo but it is only possible if the minions are killed with the same attack/ability as the poke is done.

Rest of the viable combinations are laid out in the tables.