Not sure of how to define cool but, if it realtes to enjoyable to use and a bit on the I like to show off side, then some of the Ikonta series from Zeiss and the Leica CL spring to mind but, if outside the range finders to zone focusing cameras then the Minox 35 ML and others form the company and for me the Voughtlander Vito. If other types of cameras, the Rolleiflex is the defintie one for me.