Homemade Snowglobe

Have a look at this great post:
http://kiddley.com/2006/12/01/make-your-own-snowglobe/

With notes about What Not To Do:
http://littleelephants.typepad.com/little_elephants/2006/10/arts_crafts_how.html

and about what worked:
http://littleelephants.typepad.com/little_elephants/2006/10/snow_globe_succ.html