Sellfy is a big website where you can download logos, banners, mock-ups, etc. from other people. Some people are asking money for it but there is also a page where you can download content for free.
*Scroll down for demos
How to download
Go to the website.
Choose a design.
Click on the download button.
Enter your email and click download.
Open mail and click on the download button.
Now click again on the download button and the download wills start.