There are tons of speakers, stands and stand-speaker hybrids out there for iPhone 4s, but I have to admit that the Bone Horn Stand is probably one of the most unique ones. Modeled after a gramophone record player, it adds a quirkiness to your phone in a very practical manner.
According to Book of Joe, the Bone Horn Stand "adds 12 decibels of sound pressure to your iPhone's speakers without asking for an erg of battery juice. You can also use it to prop your iPhone into a vertical or horizontal viewing position." It sells for only $24.95 and is available in three colors.