Comsic Latte Observatories All Over the World?

Did you see 1st November (2009) Astronomy Picture of a Day? link
This is it:

They say it's an average color of The Universe (named "cosmic latte"), but only this?
Some unanswered questions:

• Is this color also an average color of all observatories?
• Sholud we rename our project to "Comsic Latte Observatories All Over the World"?
• How long astronomers know this color?
• Is it some kind of conspiracy?
• Previous question can be reduced to: what is the very first astronomical observatory painted in that color?