I've chosen allow Google to synchronize information from my email to my phone, but the result is not as interesting as it sounds! I see some pictures in the Gallery that I wouldn't have in my phone, unfortunately the delete option doesn't appear for these pictures. How to delete them? Is it possible to delete all synchronized information from Gmail to phone?
Make sure your google acct doesn't sync picasa photos. ..
Then go to settings > application manager > all apps > gallery > clear data and cache. Deletes the synced album.
Similarly you can clear all synchronised data from Gmail also.
In settings->Accounts->Google->your account, you can uncheck all options.
So your Google details will not get synchronised...