Though I prefer simple skins.
Would rather not have the taskbar, titlebars, or anything like that changed out. From what I've seen, it tends to conflict with one thing or another in the end.
Then to top it off... they just simply look outdated or too "cluttered", something more fitting of the XP / Vista era, with only the Stardock ones looking more "modern", but that's all only my opinion.
Only want to change the bright white areas into something easier on the eyes, nothing really too fancy, can't find any skins that try to be minimalistic.