Girard Perregaux writes?
Yes, they do. Check this link for their collection of writing instruments. The cap is decorated with the Girard-Perregaux Tourbillon cage and the clip inspired by the Girard-Perregaux Tourbillon bridge. The pen features an 18kt NIB ofcourse.
Sorry for the lame picture (oh well, GP is to blame actually, it is from their website), but you’ll get the idea.
Also, when visitting their site, click ‘Goodies’ in the lower right of the webpage. They have some very nice wallpaper material to download.