Currently post game statistics give us total gold earned, I we could use a break down of that into the following sources

Base (includes Gp5 from Runes and Mysteries)
Items (all Gp5 granting items and bonus gold granted from an item)
Minions (all opposition minions slain, plus bonus their of from non item source (Twisted Fate))
Neutral Creeps (wolves, wraiths, blue, red, Barron)
Objectives (Towers and Dragons)
Champion Kills
Assists

That would be cool. And if you're clever, you could even use that info to find out how you get the most gold with specific champs and use that to potentially enhance your future gold income in later games. Plus it's great for people who like looking over info and other such things.