Stack Icons? Set to background?

The fontawesome demo page shows the ability to stack icons on top of each other: http://fontawesome.io/examples/

How would I stack 2 icons on top of each other in X?

I’m also curios if there is a way to set an icon as a background image with regular text on top using any of the X shortcodes?

Hello There,

Thanks for writing in! Regretfully stacking icons isn’t available with X icons. This is something we can add to our list of feature requests. This way it can be taken into consideration for future development. All of these items are discussed with our team internally and prioritized based on the amount of interest a particular feature might receive.

A background image needs an image. Setting an icon and a regular text behind a section might only be possible with custom development which is outside of our support

Thank you for your understanding.