They're (usually) animated gifs.
Try insert > movies and sounds > movie from clip art
search for shine with type "movies" selected. (you may need to be online)
Should get a glittery Christmas tree
alternatly search online
herehttp://office.microsoft.com/en-gb/clipart/default.aspx
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John Wilson
Microsoft Certified Office Specialist
http://www.technologytrish.co.uk/ppttipshome.html
