Candy Claws is an incredible group that I find very similar to BOC, but are still very different/unique. They make music about nature and people's experience of nature, and are very successful at creating a specific beautiful, dreamy, eerie feeling, which BOC also excels at. Here is an example of their music:

http://vimeo.com/19761044

That song is from an album that is a musical companion to Richard M. Ketchum's 1970 book "The Secret Life of the Forest". Here are some of the most BOC-ish things they've made:

http://vimeo.com/album/1528915/video/20914360

http://vimeo.com/21775139

Those are from a series of videos they did which they described as "a weekly series of miniature musical nature documentaries". I highly recommend that you watch the rest of them.

I really think you'll like them, especially if you also like My Bloody Valentine, who are also a big influence on their style. Enjoy!