Thanks, Ingar. After having thought a bit deeper, I speculate whether beamer can make presentations without all those beautiful ornaments; I just want a white sheet to lay down my presentations. Am I right that beamer can do that? If so, what would be the sty file to use?
If you were using powerdot, you'd just have to use the default style ("style=simple" class option) which doesn't use any ornament.
Cheers, Mael. -- Mael Hilléreau