Fun thing to do
I still think "Echoes" is one of the best Pink Floyd songs ever. That track, alone, is worth the price of entry (_Meddle_). "One of These Days" makes it worthwhile, also. "Seamus" is pretty fun (have you ever heard a dog howl the blues?).
Here's a fun thing to do: listen to these albums backwards (and by backwards, I don't mean backwards, I mean in reverse order, like so): _The Wall_, _Animals_, _Wish You Were Here_, _The Dark Side of the Moon_, _Meddle_. It's rather dramatic, especially if you do it all in one sitting, and are rather sleep deprived by the end of it. (-: