Old folder icon in Google Drive app on OS 10.10 Yosemite Have this little problem, anyone knows how to fix it? Update the app didn't help. Tnx!

So, with the help of @John the solution finds me. Thanks again!
As for new icon I used this from dribble. Hope this post helps someone else!
The folder icon is controlled by the app used to sync with Google Drive. Until the app is updated with a new icon, it will not change.