Professor Atomo's Gallery:

http://professor_atomo.tripod.com/celgalleryhome.h
tml

webdeb's anime cel gallery:

http://www.jersey.net/~dnilsen/cels/

KamuiX - Beautiful Collection:

http://www.animemagazine.com/cels/brandon/index.ht
ml

Marauder's DBZ Cel Gallery:

http://marauder.home.mindspring.com/

...these are mostly based on design but they all 
have beautiful cels too. If you want to see nice 
cels, I reccomend trying the cel ring index, all 
the galleries have good cels.

So long,
    Larg0