Yes, they can be used asa base shape hence the word "classic" in their descriptions 
ETA: The mesh starters were an interesting idea but really not very practical as you had to throw them out & start again if you wanted to get any clothes that would work with them. I'm impressed how well these turned out using a basic avatar.
I know!! Never thought I would see the day 
Check out some of the New Classic Avatars:
I think they look great! We've sure come a long, long way from Ruth
Added bonus they come with AO overrides.
Read more at New Classic Avatars are Now Available in Second Life!
Wow! Just beautiful!!
Congratulations all around
Having seen "Little Shop of Horrors" sounds downright frightening to me
Yeah, the metro is pretty good. So is the shopping in the grocery store.
Thanks!
So glad you enjoyed yourself, Alessandra! It was great that everyone turned out & had a good time
