Yve,
I'm not sure I understand your question entirely.
But if you are trying to make a graph that has "stars" in place of the bars......
Then you can double click a set of bars, then choose "fill effects" > Picture, then navigate to a bitmap of a star
picture.
Or......use clip art to add the stars over your existing bars....(then make you bars white, or with no fill color)
Cheers
TAJ Simmons
microsoft powerpoint mvp
awesome - powerpoint backgrounds,
free powerpoint templates, tutorials, hints and tips etc
http://www.powerpointbackgrounds.com