a lot of people rag on Samsung for having cartoonish looking icons on Touchwiz, IMO stock Android's icons aren't much better. They are on par with the cartoonish looks of Tocuhwiz.
I think they're much better than Samsung's icons. Cartoony? Sure. Google's always kind of been colorful/cartoony. But not much better than Samsung's default icons? Couldn't disagree more! They're much better.
Either way, I use this icon changer app, and this icon pack. Makes me happy.
ICON CHANGER: https://play.google.com/store/apps/details?id=com.jy.iconchanger.ad&hl=en
MOONSHINE ICON PACK: https://play.google.com/store/apps/details?id=nexbit.icons.moonshine&hl=en