Behold! It's a bit dodgy but if you squint, you can see My name in the images. The J, the I, and the E are Galaxies and the M and the A are Nebulae!
J: It's an artist interpretation of what will happen when M31 and our Galaxy will eventually collide http://apod.nasa.gov/apod/ap120604.html
A: This is the Cat's Eye Nebula http://apod.nasa.gov/apod/ap070629.html
M: The Snake Nebula in Ophiuchus http://apod.nasa.gov/apod/ap090220.html
I: Irregular Galaxy NGC 55 http://apod.nasa.gov/apod/ap090812.html
E: Fireworks Galaxy NGC 6946 http://apod.nasa.gov/apod/ap110101.html
Every image was either flipped or rotated to make the exact letter shape.
Lastly, If I had to communicate from someone not from this known earth, I'd prefer to use body motions ( think interpretive dance) or Images, not any written words, maybe I'd use science, it is pretty universal, but to me pictures sound like the best option. But how do we know they se the same as us? if they se at all? Maybe there's no one out there who can at this time communicate with us in anyway. We don't have all the answers, but we keep the frequency of neutral Hydrogen under close watch, just in case anyone wants to drops us a line using the most abundant source in the universe/.