Check it out on the Open Graph Protocol Tools plugin page.
Here’s what it looks like in context:
How do I make one of those cool banners for my plugin page?
Start by creating an “
assets” directory in the root of your SVN checkout. This will be on the same level as /tags and /trunk, for example.
Inside that assets directory, you can make a file named “
banner-772x250.png” or “
banner-772x250.jpg“. The image must be exactly 772 pixels wide and 250 pixels tall. No GIFs.