Standard:
There are many options for invite button skins. The skins (ie: button_square) match the filenames seen below minus the extension (.png). We are regularly releasing new skins.
Custom:
Many of our partners have created custom buttons using a Javascript function to launch the invite from a link: (loadInviteInModal(0);). Place a standard widget anywhere on the page (in a hidden element, ie: style=”display:none”) and use your button to launch invite with the function. For more information, please review the instructions for using invite with AJAX/Flash.
Our Terms of Service for partners require the inclusion of some form of the green icon in your custom button.