This is the whole nebula. Think I know which picture you are talking about. The Horsehead.
The Horsehead nebula is cool but I found the one I was thinking of.
http://www.astrographics.com/cgi-bin/ase/ase.cgi?affiliate=&mode=display&gallery=1&type=favorite&color=&keywords=&page=1
It's in the Eagle Nebula and the pic above is a cropped image...the whole thing is awesome!