For XenForo 2.2.x with article forums without a attachment set in the thread. You can define a default cover image for the preview style, not for thread view, so the are no blankets anymore in the preview grid style. Installation Auto-installation Go to ACP->Add-Ons and upload the ZIP file...

Live example: Gaming Forum Description Simple add-on that adds article cover images to tags/search results. Screenshots Live example: Gaming Forum