I travel a lot for business and I have black luggage. I tie colored cloth ribbons on mine and I have a red wrap on the handles. I never have a problem finding my luggage. As for locks, I don't think they are very helpful. Anyone at the airport could get a TSA key and open them. Just make sure there are no valuables in your luggage. Pack your jewelry and electronics in a carryon bag - do NOT check that bag. Thieves aren't really interested in your clothes.
As for things to do on the plane, ebooks and iPods are wonderful. Also make sure you bring an eye cover and ear plugs.
Pam