There are a lot of great products out there now, made especially for PL, and when I buy stuff lately, I tend to gravitiate toward those things. But I also really enjoy making my own cards. I've made a LOT of them. I'll show you how they're organized later.
Here are some filler/journaling cards I've done recently with pop culture references. I have geeky taste in pop culture. Be warned.
top to bottom, L to R: The Wire, Twin Peaks, Doctor Who, Doctor Who, Flight of the Conchords, Dirty Dancing, The Breakfast Club, The Wire, Harry Potter.
I really love writing on dark paper with a white pen. The navy and black cardstock were sprayed with white paint and pearl glimmer mist before I cut them to size.