Kodi + Steam + EmulationStation

"Aeon Nox" skin http://addons.kodi.tv/show/skin.aeon.nox.5/ + "Steam Launcher" http://forum.kodi.tv/showthread.php?tid=157499 + "Advanced Launcher" http://gwenael.ca/forum/announcements.php?aid=4. "Steam launcher" is for launching Steam. Add "Emulation Station" inside the "Advanced Launcher", then make "Emulation Station" a favorie. Activate the "Aeon Nox" skin. In the skins settings you can add and rearrange the main screen buttons, add the "Steam Launcher" and the favorite "Emulation Station" to the main screen.