Use default shortcode for social icons

Hi,
I started to use the default shortcode in the Header option panel…

[ish_icon icon=”ish-icon-twitter” icon_url=”//twitter.com/ishyoboydotcom” text_color=”color2″ active_text_color=”color17″ type=”simple” global_atts=”yes” tooltip=”Twitter” tooltip_color=”color17″ tooltip_text_color=”color4″]

And I like how they look.

I would like to use the same style for all my social icons.
I tried to add HOUZZ like this: ish_icon icon=”ish-icon-houzz” but, as you can see in the screenshot, it looks without icon.

https://dl.dropboxusercontent.com/u/42997297/default%20style%20ishyoboy.png

Also I found in this support forum some help to use personal Fontello Icons and create a new shortcode through the page builder like this:

[ish_icon icon=”ish-icon-houzz” icon_url=”//https://www.houzz.es/pro/paglialongastudio/paglialonga-studio/” text_color=”color3″ active_text_color=”color5″ type=”simple” global_atts=”yes” tooltip=”Houzz” tooltip_color=”color5″ tooltip_text_color=”color1″]

It works but the style it is totally different compared to the default and I does not like.
Is possible to add some icons more and show these through default style like the screenshot?