It really costs you nothing but the small effort involved.
Just click on the banner below and you'll go to AllPosters.com. Create a Log In (your screenname or perhaps your email address) and a Password for yourself. Fill in your website name and URL and a short description of what your site is about. Set yourself up for Direct Deposit of earnings (really the easiest and fastest way to get paid) with the numbers from the bottom of one of your checks.
You can select from their enormous collection by keyword search or by artist. The HTML coding for text and graphic thumbnail, large or small, with your site as reference is created for you to copy and paste into your site.
That's all there is to it!
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If you use the banner above, you will be eligible for affiliate assistance via email, if you ever need it, from the webmaster here at Middle Age and Other Mistakes.