http://www.grsites.com/modperl/tile.cgi?dir=comp&fn=comp024&ext=jpg

http://www.hasslefreeclipart.com/clipart_school/page1.html

Ray gun:
http://office.microsoft.com/clipart/results.aspx?lc=en-us&Scope=MC%2CMM%2CMP%2CMS&Query=ray+gun