I came across these space recommendations from the Da Vinci Institute:

4) Experiment with creative spaces so the future role of the library can define itself. Since the role of the library 20 years from now is still a mystery, we recommend that libraries put together creative spaces so staff members, library users, and the community at large can experiment and determine what ideas are drawing attention and getting traction. Some possible uses for these creative spaces include:

a. Band practice rooms
b. Podcasting stations
c. Blogger stations
d. Art studios
e. Recording studios
f. Video studios
g. Imagination rooms
h. Theater-drama practice rooms

We have come a long ways from the time of da Vinci and the time when books were chained to lecterns. But we’ve only scratched the surface of many more changes to come. Writing the definitive history of modern libraries is a work in progress. Our best advice is to enjoy the journey and relish in the wonderment of what tomorrow may bring.

http://www.davinciinstitute.com/page.php?ID=120

Seems like a good start ...