Simplicity is the ultimate sophistication.
Here's a screenshot of my dock at the moment.
Left to right: Finder (TotalFinder), Mail, Safari, Chrome, iTunes, OmniFocus, iTerm2, Activity Monitor, and mpv. Everything except mpv is persistent; mpv is there because I happen to be looping a piece of music with mpv that I don't plan to add to the iTunes library. The point is that it never looked this good, mainly due to the updated OmniFocus icon. Finally they put some serious thought into graphics design! Just compare the v2.1 icon to the v2.0 version.
Obviously the overpolished (and honestly, badly polished) 2.0 one belongs to the past. It "stood out" even among Mavericks dock icons (in terms of color), not to mention among the flattened-down Yosemite ones. Today, it finally becomes a native member of the dock. (Well, actually not today — I've been using the beta for a while, so the new icon didn't come as a surprise.) In fact, this time the Omni Group seems to be on a graphics design streak these days, and today they have a really impressive App Store feature banner: