The following links and photos show unique ideas and examples of Arduino projects.
Quadcopter–Photo Courtesy hacknmod.com
Quadcopter–Photo Courtesy Engblaze.com
Remote Car Starter–Photo Courtesy hacknmod.com
Word Clock–Photo Courtesy cdn.instructables.com
Robot on Tracks–Photo Courtesy Robotshop.com
Key Glove–Photo Courtesy keyglove.net
Diagram of an Arduino–Photo Courtesy SparkFun