Some typical cubicle decorations:

• Dilbert cartoons
• pictures of family, friends, pets, children, or significant others
• coffee cup with pens in it
• calendar, either on the desk or the cubicle wall
• Successories style posters

Some of my cubicle decorations:

• postcards of various places, like Bunratty Castle, New York City, and Weatherford Hall
• some "Life in Hell" cartoon postcards
• a picture of my boyfriend
• a desk horoscope calendar
• a rubber spider
• a bunch of empty Mountain Dew bottles
• little plastic aliens
• a bunch of foam squeezy things that I've received at vendor fairs. Includes an apple from Symantec, a NetGear man, a Corel linux box, and a Tektronix printer.
• an ad for a PT Cruiser
• a box of Stash Tea and a cup to put it in
• a bumper sticker that says "Bark if you heart the Dog House"