All you really need to have a "hydroponics system" is to grow plants in any media "other than soil," provide water, aeration (oxygenate the root), nutrient, light, proper humidity and temperature. Voila!...
Now all you need is a little imagination and you can be an inventor and cultivator in one shot...
Or... if you need some inspiration, check this out:
http://www.hydroponicsearch.com/Expl...ponics_system/