A 32qt box will work great for adults. I keep mine in 28 qt boxes. Just make sure you have an area with adequate temps (Warm side ~ 95F, cool side ~75-80F).

As far as morphs go-

Albino (paradox and typical)
Anery
Snow (paradox and typical)
rufescens (stripes, tiger, granite, normalish, solid brown)
hypo
reduced pattern
dodoma
flame
high orange

I am sure I missed some so feel free to chime in....

As far as the eggs go. So far 2 species of sand boa are known to produce eggs.... Eryx muelleri and Eryx jayakari.

For more info check out - www.kingsnake.com/sandboa/sandboa.html

-Chris
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Christopher E. Smith
Contact
Captive Bred Herps