These ones are pretty sweet:

Front (white)


Rear (red)


They are USB re-chargeable and also come in a variety of sizes (front only) and colours. The front one has 3 settings (on, high-beam, flashing) and the rear has two (on, flashing). They're super durable -- I own a couple pairs and love 'em.

There are also plenty of integrated lights like these:
if you want to spend some money on new components.