I have an excellent book called, simply, "Sand".  It is large-format and
beautifully illustrated, presenting many highly technical geological aspects of
sand in an extremely inspiring way.  It might well be a useful source of ideas
and inspiration to you, if nothing else.

Sand. Author : Raymond Siever. Publisher : Scientific American Library.  ISBN
0-7167-5021-X

By the way, let me know if you need any help with hands-on exhibits.  You might
also be interested in our new Interactive Science web-site :

http://ourworld.compuserve.com/homepages/in tsci/

--
     [log in to unmask]  ~~~~~~~~~~~~~~~~~~~~~~~~  Exhibits, Exhibitions
                              :)nteractive Science
               Ian Russell                            & all Serious Fun
                            ~~~~~~~~~~~~~~~~~~~~~~~~