I've noticed this subject brought up many times (people wanting to know where they can buy "colored" PVC pipe and fittings).
I recently recieved an e-mail notice from FlexPVC.com that they have acquired a limited stock to sell and may decide to carry it permanently if there is enough demand to justify adding it to their regular inventory.

Just thought I'd pass on the info for those interested.

Main Website: FlexPVC.com

Colored Pipe:

Colored Fittings: