Well it isn't like they wouldn't get used for other purposes!
Instead of getting dildos to use as lightsabers, you could buy lightsabers to use as dildos. FX lightsabers are pretty sweet...video. My cousin had one and the first thing he did when he showed it to us was smash the overhead light on his fan, spraying glass everywhere, haha.
The idea of using blue/red/green dildos for this purpose has crossed my mind as well. When I was reviewing the blue O2 Revolution, I waved it around to test for floppiness and the first thing that came to my mind was Luke waving his light saber for the first time in Episode IV.
That sounds like a fantastic idea for this product as well.