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The gifs are some of the best ones I've ever seen. They are almost perfectly seamless!

Sounds like you would enjoy cinemagraphs. For example: http://annstreetstudio.com/category/cinemagraphs/

Thanks for the link. Particularly interesting is the Q&A post where they discuss HTML5 vs GIF http://annstreetstudio.com/2011/12/22/the-other-half/

Thank you for the link. I'm going to have fun looking back through all their posts.