ThemeForest

ThemeForest is part of Envato Market. At ThemeForest you can buy and sell HTML templates as well as themes for popular CMS products like WordPress, Joomla and Drupal. Items are priced on the complexity, quality and use of the file; the total price also includes a Buyer Fee. The site is home to a bustling community of web designers and developers and is the biggest marketplace of its kind. 
All members can act as affiliates by following the steps outlined in these terms. Just remember that if you want to actively participate in the Affiliate Program there are few things you'll need to keep in mind which are explained below.
Refer new users to any of the Envato Market sites and you'll receive a percentage of their first purchase of Envato Credits or first purchase of an item!
Referral code: Every member automatically has a referral code which is generated using your username. This referral code is available on the referral page.
Simply paste a link or image button on your site using that code. If a new user clicks your referrer link and proceeds to sign up an account and purchase an item or Envato Credits via any of the Envato Market sites, you will receive a percentage of that person's first purchase of Envato Credits or first purchase of an item.
Referral program percentage: The earnings you will get for successfully participating in the Affiliate Program is set out on the payments page.