Hasbro announces THIN-TRONIX which includes, among other things a poster phone:

This is a radical twist on the standard wall phone. It's a real working speakerphone that's just over 1" thick and meant to be hung on a wall. The Poster Phone makes group calls easy and fun. The eye-catching design comes in two colors. You can program up to five numbers into the Speed Dial memory and write those names in the erasable spaces on the poster. It's battery operated and comes with all accessories included. Just plug it into any existing phone line and dial away for endless hours of hands-free talk time.

...via The Shifted Librarian