Page 44 of Joe Pivetti's Artsy Fartsy Snapshots (click on image for full size view).  Most of these images were taken at the Bach cactus nursery in Tucson, AZ.  The people there are very nice and very knowledgeable.  I bought a couple of cacti with a certificate to allow us to bring them home to Huntington Beach, CA. 

Baby cacti wear hats in the winter	The brush off
Feathery flora	Cacti commune
Cacti greenery	Cacti whitery
Cactus spiral	Red-headed cactus
Fuzzy wuzzy cacti	Ugly bugly catus
Cacti forest	Crown of thorns
Leaning tower of cactus	Unshaven cactus