there are a few problems with the majority of bike lights. firstly, they are usually not that simple to attach to the frame or handlebars. secondly, people are afraid they will be stolen; a lot of them are removable, but this leaves a big clunky attachment piece on the frame or handlebars.
there are also other, less obvious problems too, such as the one i currently have: i have two bikes, but only one set of lights. i'm never going to be riding both at the same time, but it is a bit of a hassle to have to remove the whole attachment bracket every time i switch between bikes (which is quite often). therefore, my only option would really be to have two sets of lights, which i think is a bit of a waste.
but recently i've come across the solution. the above image is of the frog strobe lights, by knog. the use of silicone as a material has really freshened up the whole bike lights area, and pretty much solved all of the previously mentioned problems!
they are easily attached, and easily removed. they are flexible, but remain secure. they come in a wide range of colours, and you can get hold of a front a rear light from as little as £10 for a single LED model.