Guitars and basses can be very prone to accidents, even in the most careful hands. Remember, its often everyone else you need to worry about. No guitar that you care about at all should be left leaning against an amp an effective stand is essential.
Heres one of the simplest and most effective designs:
Things you may wish to consider when choosing a stand could include the number of guitars you regularly wish to protect and whether or not you require a neck support. Its also worth remembering that some guitars may have a finish that reacts to contact with certain types of rubber.
Wall hangers provide an excellent way to save space in your practice area.