A warning before we start, this project should give little trouble to experienced laser modders, if you have never built your own laser I would suggest starting with something more basic.
Using inexpensive and easy to get parts, build a 7 colour, including of course white, hand held laser.
The following parts will be enough to build a bare, 7 selectable colour laser, it is up to you to make the housing of your choice. This could easily be built into a project box but I wanted a hand held pointer. Video link below shows what I decided to do with it.
http://www.instructables.com/id/7_colour_laser_optics/
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