I recently bought a laser pointer with a friend. I ordered a blue one and he ordered a green one. His came with screw on heads that could make really cool looking shapes and one was actually a kaleidoscope piece that looked amazing.
I tried his lens on my blue laser pointer and it works great...
I recently bought a 50mW Purple Blue Laser Presentation Pointer from Amazon and would like to also purchase some cool end caps that will make it act like a kaleidoscope and also one that helps focus the beam better. I heard that there are better "lens" that you can buy to help them focus better...