When you select the leaf image (braille #5) on either the Fox.com/Fringe or ImagineTheImpossibilities.com sites, a weird sound is played. By isolating the sound, and playing it backwards, a hidden message is revealed - Expand Your Consciousness!
Thanks to Pwn Master Paladin for noticing the strange sound.
You can hear the original and reversed sound below.
Original (Download MP3):
Reversed (Download MP3):