I used spiral wrap and black cable ties. The spiral winds round all the cables and makes them into one neat little bunch. It has really tidied up mine.

A metre of this stuff:

http://www.autowirez.co.uk/product.p...cat=259&page=1


and a pack of cable ties:

http://www.autowirez.co.uk/product.p...cat=249&page=1




A grand total of £few quid. Some people also use heatshrink but i prefer the spiral for easy access on maintenance.