Quite simple, really. There's this website, topsters.net that allows you to make a list of your top 50 or 100 albums.
I made my top 50, but realized I left out a ton of albums I love, and then just made another top 50 and put them together.
It's kind of difficult to make these. Not only does it take quite a while to add all the images and think of 50 or 100 albums that are your "favorites", but there's also the fact that people discover music constantly, and the list you make now could be completely different than one you could make a few years from now.
But still, I'd be interested to see some of your guys' lists if anyone's willing to put in the time to make one.
Here's my top 100: