Sony Speakers - £12.99
Uber cool looking speakers, these are passive speakers which means they don't require any batteries to power them. The speaker also includes interchangeable caps, so you have the option of black or silver front panels. It can be used with mp3 players, iPods or any other music player with a 3.5mm headphone socket.
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Macally PodWave Speakers - £4.99
Due to the Podwave's small size and their ability to plug in the top of a player, they would be more ideal for playing audio books or listening to voice recordings. For playing music they may disappoint many, but in the case of traveling extremly light then they might well suffice.