Are you looking for an Xperia theme with flat icons well you must see this Pure Xperia Blue Flat Theme with Flat Icons Pack. It follows the blue as ascent color in the theme with all system icons customized in flat design. You get colored status bar icons along with Xperia themed soft navigation keys.
All system media app are themed with flat icons. It will work only on rooted Xperia devices with SuperUser Mod installed with Xperia Xposed. Install as normal apk or push in system/media app folder.
Pure Xperia Blue Flat Theme
Download the theme from below. Force close the home app + system UI to get fully themed system UI + Home.
Let us know if you like the theme, drop your comments below.