I found Beamer to be rather popular at CERN and it's certainly the only decent way of making slides I've found in recent years (in all fairness, the Sozi/Inkscape pair isn't bad at all either). So I thought I'd write a Beamer theme following the official CERN design guidelines.
Copy the files to ~/.texmf, /usr/share/texlive/texmf-dist (if you use
Tex Live), /usr/share/texmf or something similar.
It's not provided here but there are official CERN logos available for download. Download the CERN logo pack.
A quick and dirty way to include a suitable logo is to copy the
CERN-LogoPack/Outline/PNG/WHITE/LogoOutline-04.png file to the directory
where your slides are. Rename it to cern-logo.png.
A cleaner way would involve using a vector graphics editor such as
Inkscape and editing the CERN-LogoPack/Outline/Format PAO/LogoOutline.svg file to turn the logo outline white. Then export it as a
PDF file to the directory where your slides are. Rename it to cern-logo.pdf.