Modding computer+nitrous=cool?

I've looked pretty hard and I can't find any reasonably small nitrous oxide or other canned air sprays for a mod I had plans for
I'm looking for something that has a colored spray to it, preferably some aerosol form
obviously this means it probably has to be a liquid
nitrous seemed the first direction
but once I did find colored nitrous all I found was immensely big bottles
I'm looking for the sub-20 oz range
anything from 4-12oz would be perfect

so can any of my fellow modders help me?

the idea goes with a theme for a case I'm working on and I need a green spray, I've figured out how to hook it up so it will spray for a second when I turn on the computer using a momentary switch
when it powers on it will spray out for a second or two
after a little work around I'm pretty sure I can get it to work with a smaller bottle
thus far I've got it working with a 20 oz, and if I can't find any smaller ones I've started on a design to filter it into a series of smaller tubes

 

sounds really cool, what is the theme of the case

 

couldnt CO2 be cheaper and easierto get then nitrous oxide.

 

what would be really cool is if you got it to spray directly onto the fins of a radiator to cool your water like they do on performance turbo system. Now that would be hype.

 

Have fun getting 4-12oz bottles of NOS. :/

 

Have you tried a Grateful Dead concert?
...Oh, wait... Jerry's dead.

 

the theme of the case is biohazard
and CO2 would be cheaper but it doesn't like colors and if it hits any components it can seriously mess them up
and since its meant for show, its going to shoot outside the case not into the radiator (sorry)
and I've found a solution, a local autozone techie brought out a nice 12oz canister, that he uses for paintball, that was empty and showed me how I can transfer my 20oz green nitro spray into it, though its only good for about one shot, I can fill it up time and time again
and btw, a random 12oz canister isn't a good idea to store this stuff in, the psi could easily make it explode, grab yourself a certified paintball canister for nos
they have little paintball pistols that use little nitro canisters of the same size
and its easy to outfit them with a spray nozzle thus you have the awesome mod