Similar Tags with introtext and images module displays on a Joomla 3.1+ powered site the title, introtext and introtext image (if exist) of other content elements with similar tags. The closeness of the match, the intro image width and alignment can be set, and the markup have proper hooks to be styled as you need. As an added feature over the core similar tags module, this one uses the current page ItemID if no menu item for the active tags is found, to avoid problems related with using the default (home) menu ItemID on sites which are using special home page setups.
UPDATE: Version 2.1 adds ability to display article intro and fulltext images too, the module admin interface let you choose what type of images you want to display, article intro image, article fulltext image, first image found in the article body OR first image found from all 3 options (so, intro image if is set, if not, the fulltext image, and if that also is not set up, then the first image found in the article body.
The module is uses the ALT and FLOAT attributes set for the article intro and fulltext images too.