Sorting my archives, I uncovered an old collection of presentations I created in 2001/2002 when I was a student. I’ve just generated out of these original slides templates for LibreOffice.
First, here is Blue Curve:
Second presentation template is Fancy Window Frame:
Here is its direct download link.
As for all my document contributions, these templates are distributed under a Creative Commons BY-SA license. And if for any reason the LibreOffice repository is down, here are mirror of the templates served from my site: Blue Curve & Fancy Window Frame.