Different font for different Button?

Is there a way to have different font for different buttons??

You can have different fonts for different toolbars, but not for two buttons on the same toolbar.

There are some very good fonts these days with symbols and icons for almost every requirement which would eliminate the need to create icons for different resolutions and different colors. All you would require is a little bit tinkering with the font size and color.
Its not possible at the moment to find all the relevant icons in a single font. Would be very useful.