I hope you don't mind but when I couldn't find a metro style icon to go with the Modern skin I decided to make my own by modifying your design:
(http://i.imgur.com/QOP8Nr0.png?1)
https://www.dropbox.com/s/ed15mi217sqdlb5/MetroBadassBee.7z
Would you add the new icons to the wiki?
http://musicbee.wikia.com/wiki/Icons
http://musicbee.wikia.com/wiki/Theater_Mode#Adding_a_new_view_to_this_page
You can find instruction for how to add a new entry on the Theater Mode page. The Icons page is still a little rough. Thanks!