Native Lithium responsive is very new and im not aware of any who are responsive and also heavy on media however the new lithium media experience is responsive and does have responsive component's which allow you to surface photos from within the community.
I suspect we'll start to see more examples soon as the early adopters who went on the beta start to push their new responsive community live and maybe one of the other guys has seen what your after and able to share an example.
Is the pictures dock similar to what is used in the Lithium Communtiy? For instance, at the top of the page here.
Here are some examples of communities that use responsive design and media experience, in general:
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