The icon that gets associated with the desktop entry for teamspeak3 (the 2 screens with the green check in front) is not the official teamspeak logo. I always found it a bit weird in my desktop menu. I searched a bit, and there happens to be a .png file called "teamspeak3-client/pluginsdk/docs/client_html/images/logo.png" that just looks like the teamspeak3 logo. I think it would look good.
Thank you for reporting this location; when I bumped this I was looking near the previous location and didn't find a better file, it indeed was somewhat weird. + 13 Feb 2013; Tom Wijsman <TomWij@gentoo.org> + -teamspeak-client-bin-3.0.6.ebuild, teamspeak-client-bin-3.0.9.2.ebuild: + Removed old 3.0.6 ebuild. Made the desktop entry use a better logo as its + icon. Thanks to Mikkl for reporting, fixes bug #457152. It might take a few hours before this change has propagated to your local mirror.