Is there a way to change the background wallpaper for the lock screen? my friend's htc hero is able to do that, so I'm wondering why isn't there an option for the droid?
A gun in the hand is better than a cop on the phone.
Only the Skilled Survive
A computer lets you make more mistakes faster than any invention in human history - with the possible exceptions of handguns and tequila.
Drill Sergeant Frick's Rules For Un-armed Combat.
1. Never be unarmed.
2. See Rule #1
USMC rule # 23 of gunfighting: Be polite, be professional, but have a plan to kill everyone you meet.
OK, others gave you alternatives... I'll give the short simple reason. the Hero has HTC Sense, a skin overlay on top of Android.
(Personal Opinon) It gives you the ability to turn your Android device into a Digitially Clueless Beauty Pagent Queen of a phone, whereas the Droid eschews additional skins and relies on the sleeker and more robust tape a scud missle to a race horse fast Desktop.
That's why you don't have the same options, out of the box.