Is it possible to use the same visual style of the big green "Share" button of the "Post" global action, or the "Create" for the "New Case" action?

I know it's possible to replicate this through html/css only, however I would like to know if there is something native on visualforce that will allow me to accomplish this.

Thank you.

I'm trying to use a list o images as options on my <apex:selectRadio>. However, the SelectOption constructor accepts only String as value.

Is there a way to achieve this on Visualforce, or is there really a limitation on this?