[css] Bootstrap 3: Using img-circle, how to get circle from non-square image?

You stated you want circular crops from recangles. This may not be able to be done with the 3 popular bootstrap classes (img-rounded; img-circle; img-polaroid)

You may want to write a custom CSS class using border-radius where you have more control. If you want it more circular just increase the radius.

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.CattoBorderRadius_x000D_
{_x000D_
    border-radius: 25px;_x000D_
}
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<img class="img-responsive CattoBorderRadius" src="http://placekitten.com/g/200/200" />
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Fiddle URL: http://jsfiddle.net/ccatto/LyxEb/

I know this may not be the perfect radius but I think your answer will use a custom css class. Hope this helps.