Comment 11 for bug 741804

Either "user-trash-unity" or "user-trash-symbolic" is fine, but definitely not the third option. The last one breaks fallbacks as per icon naming schemes.

 "user-trash-symbolic" would be the best way to go, since -symbolic is something which we are definitely planning to do.
We do plan to merge ubuntu-mono-dark and ubuntu-mono-light into one theme when we have the symbolic icons working similar to GNOME3.

@Rosie! : I'm not sure if Otto has seen these icons, but I have one small critique, if you dont mind... :-)
To have crisp icons, straight lines *need* to be pixel aligned , otherwise the lines will be blurry. What i notice in vector_icons_24_03.ai , is that the "_" and "|" lines inside the workspace switcher are blurry, you can fix that by aligning the lines to grid. I can also see them in the trash icon, but less prominent than the workspace switcher.

If you are using inkscape, turn on the grid view, it will help you with aligning to grid.