Since I boot to HBC from Bootmii a lot I cooked this up not the most creative of ideas but still here's a share from ole Wiisel
Feel free to tweak or whatever you may find the levels wrong for you as I tweaked it for my TV. Origionly I used the same bluish hue bootmii button have but this made it rather dull looking so opted for a lighter chromeish look.
http://www.multiupload.com/OXRU8QFYN5
Also attached the background.png for gecko
http://www.multiupload.com/POK7Z0N7B5