École polytechnique with Institut Polytechnique de Paris
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All the color variants (both in png and vector graphics formats) of École polytechnique, IPP logos can be found in this archive file.
Poster templates can be found here: poster.zip for the TeX version and postersppt.zip for the ppt (Powerpoint, …) version
An example of a team poster in Powerpoint — customize to change the content, keep the look & feel to the extent possible: Dropbox link.