shorcode options

You can add in any options into the shortcode “name” field that you would normally put into the “class” attribute in HTML. Or you can just do straight HTML instead of shortcodes, if you so prefer. But this works:
[icon name="icon-paypal icon-2x"]

Icon stacks don’t work via shortcode (most likely, you can try it) as it’s a bit more tricky and you’ll have to use HTML for that. However, I already have some development code in the works that would allow stacks via shortcodes. Will likely be a month or two before I can fully implement that, however.