I didn't see it either. Someone on one of your posts mentioned a few listed in the DIY section:
http://birdboard.com/forum/showthrea...t=pvc+playgyms
http://birdboard.com/forum/showthrea...t=pvc+playgyms
The other thread didn't have a picture posted, so it wasn't something you missed, they mentioned a book of playgyms.
I hope these help.