Try the first Bm position (as described by Peter T.) but with the forth string left open. This works out to be: 1st string 4th fret, 2nd string 3rd fret, 3rd string 4th fret, 4th string open.

The low "D" produced by the 4th string, at least to my ear, makes for a "warmer" Bm chord. It's also easier to finger!

Mike