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@clefty
You can also use LED 'throwies' for this, even less bulk - all you need it 3v battery, led, rare eath magnet, duct tape. I found they last about 2 weeks - but are always on.
http://www.instructables.com/id/LED-Throwies/
I like the accompanying video
I have some tyreflies with the diy presta adaptor to, they're pretty good, makes the battery last longer with the motion detection. I'm thinking of using the motion sensor to make them into something better though. Will report back with results, I have a box of LEDs,magnets and batteries at home