Stellar Rorschach Test

Do you know how the most famous nebulae are named? They can be referred to by their Messier designation, like M42 for the great nebula in Orion. Messier was a comet hunter who logged any stationary fuzzy thing in the sky he could find so he would not later mistake it as a comet. However the the less clinical names for nebulae are more interesting. Many resemble some familiar object here on Earth. Take a cosmic Rorschach test and see if you can identify which of the below nebulae is the Swan, the Trifid, the Horsehead and the North American.