the punch cards you get in gnomeregan all have hidden binary messages on them which can be translated easily from screenshots with an online translator. I have them all here.

White Punch Card

Thrall and Jaina sitting in a tree, K-I-S-S-I-N-G

Yellow Punch Card

If you can read this, you're standing too close

Blue Punch Card

The gnome king wears night elf underwear

Red Punch Card

Help! I'm trapped in a binary punch card factory!

Prismatic Punch Card

Message to Castpipe: your laundry's ready for pickup.