I recently saw a screenshot of the Cycircled mod and I realized that the glossy buttons texture overlay would complement my UI perfectly. So after a bit of messing around in the .lua code of Trinity Bars, and borrowing an image from Cycircled, I came up with this.
I take no credit for anything besides modifying some .lua lines. I won't guarantee this will work with your Trinity Bars.
Extract to your WoW directory AFTER you backup your original TrinityBarsButtonSkins.lua