Active Media Products has a bunch of different USB drives that work for USB 2.0 and more than a few USB 3.0 drives. The flash drives the company offers often have odd designs. The latest flash drive from the company is called the Key Drive and you can tell what it looks like from the name.
The drive is shaped like a key and has exposed USB contacts. The idea is that the shape of the Key Drive will let it be carried on your keychain and blend in with the other keys you already carry.
The body of the drive is metal and it is less than 3mm thick. The thing is offered in 4GB and 8GB capacities and will work on Windows, Mac, and Linux machines. The 4GB version is $12.95 and the 8GB version is $21.95.