In 2012 I created devices mockups and was selling it since on graphicriver. https://graphicriver.net/item/devices-responsive-web-mockups-/2920264 https://graphi

In 2012 I created devices mockups and was selling it since on graphicriver. https://graphicriver.net/item/devices-responsive-web-mockups-/2920264 https://graphicriver.net/item/devices-responsive-web-mockups... . It was sold more than 3400 times already, and made about $800/month in the first few months. Now the income is somewhere around $25/mo but it's been 4 years since. The funny thing is, that I have never seen these devices close-up in real life before creating these mockups :)