Recently on an ebay shopping spree i bought a bunch of Blue LED light strips, they come with a 12v adaptor and several strips you can link together
They are really cheap now, and look awesome, any one who visits the house comments on them. Cool thing is you can stick them anywhere, behind the TV, on top of kitchen cabinets, in the bathroom or under the bed.
Well worth the small cost to make a real impact 
A typical example on ebay UK is 
http://cgi.ebay.co.uk/Blue-Green-Red...item439aa95b3b
But I bet in the US they are even cheaper.