There are only so many ways to make glasses on a skin. My way very similar to Your Local Fish Nerd's. You could also just take of the top line and put in the lenses(?)
But here's my example: http://www.planetminecraft.com/skin/mortem/

Your Local Fish NerdThis is how I make my glasses for skins.
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Thanks, but this isn't exactly what I'm looking for. They seem too geeky/nerdy for my tastes.

This is how I make my glasses for skins. I use McSkin3D which allows me to use transparency for the lenses.

For the frames, I make either of the two pictures below depending on what kind of glasses I want to use
http://imgur.com/a/sw0Zi
http://imgur.com/a/SdZi4

Then, for the lenses I go down to the "A" part of the RGBA bit of the color wheel and go about halfway for transparency. I usually use either white or gray if the lenses don't need to be any specific color. With the transparent lenses added, it should look like this:
http://imgur.com/a/CNz6G
You may want to mess with how transparent the color is and what color you use to see what you like best. I hope this helped!