montesjmm

This plugin allows to attach pictures and multimedia files to comments (the same types allowed in wordpress’ multimedia library).
This plugin has been tested with Twenty-Eleven and Twenty-Twelve themes.

mooontes Comments Media Upload

This plugin allows to attach pictures and multimedia files to comments (the same types allowed in wordpress' multimedia library).

foter

Foter is the easiest and fastest way to add Creative Commons photos to your blog. We find and host millions of photos from many online sources and make them available to be included in your blog posts.
This plugin lets you seach, manage and add Creative Commons photos to your blog posts in a very simple way.
Some of the features:
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Image resizing: flexibility and preview feature
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Image download: you can use plugin or simply download image from foter.com website
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Attribution info: all attribution information is automatically added to the photo, so you don’t need to add it manually
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Search photos: you can search photos by tags or keywords
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Speed: very fast and easy to use
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Website: <a href="http://foter.com/" title="Free Stock Photos Foter.com" rel="nofollow ugc">Free Stock Photos Foter.com</a>

Free Stock Photos Foter

This plugin lets you easily search, manage and add free photos (more than 180 mln of them) to your blog posts.

mooontes Comments Media Upload vs Free Stock Photos Foter