Optics kit?

Hey I was just wondering if there is a site that sells optics kits? I ordered a 300mW Cute red laser from O-like for my first laser. (im sure ill be buying more in the future) But sometimes i see pics on the internet of people putting different end caps on their lasers that will show different cool patterns. For example, a lens that will split the beam into many other beams that scatter all over.. Im kinda new to this so sorry if this may seem like a dumb question.

Thanks.

4 patterns grating cap /for red,green.blue laser [OL4G] - $6.99 : Welcome to O-Like.com, Your source for laser products
Starfield laser diffraction grating [M0007] - $1.49 : Modwerx Shop
Starfield Diffraction Grating [diff_star] - $5.99 : StoneTek Electronics, Your Laser Parts Store

*shameless plug of some tinkering of mine*
http://laserpointerforums.com/f42/pimp-my-diffraction-grating-59008.html

Hey hi,
You have added very good information on the topic......


Thanks for sharing this with us...