(Thanks to Starts With A Bang! reader benhead.) The Hubble Space Telescope has released some beautiful images of colliding galaxies in a huge collection! Here are some of my favorites, with my very own names for them (real name in parentheses).
We'll start with the Glowing Arrow (Arp 148):
The Highway Windshield (NGC 6240)
The Flaming Splinter (NGC 6670):
And finally, I call this one "my new desktop wallpaper:"
I was going to write a whole bunch about this, but I have been beaten to the punch by Universe Today, Bad Astronomy, and Will Gater. I'll have to wake up earlier next time! In the meantime, get all of the pictures from the Hubble Site itself.