I just turned all the login stuff off. Pretty annoying having to login to your home machine IMHO. Just set the privs so a dumb sister (or parent for that matter) can't go and mess with the UNIX stuff or install anything...
If you find yourself sided with the majority, it is time to change your thinking.
A solarized (thanks photoshop) picture of me for my login and another of my girlfried...ahem wife i mean for her profile (I used to have a rose for her (oh so romantic...) and a... monkey for me (oh so... unromantic !)
am I the only one to find the os x pictures in the login icons very stupid