This nozzle, pump, and filter combination will produce a beautiful, large, clear dome. Position your fountain in a sheltered area away from wind, because domes can assume uncontainable (though interesting) shapes.
Adjust the faucet to control the size of the dome so the water is collected in the basin.
You may want to play with different deflectors, or try levitating different spheres. Add LEDs or other lights for night- time viewing. Cruise a few of the websites devoted to laminar-flow water features for endless ideas. A particularly good one is http://laminar.forumotion.com.
And prepare to become addicted.
This project first appeared in MAKE Volume 32, page 124.