I installed some new "fancy" faucet, and am quite happy with it, except it lacks an aerator, and water easily splashes out of the sink. Obviously, this faucet is calling for an aerator. Unfortunately, the manufacturer doesn't sell aerators for this model, and my local hardware store doesn't carry any that would fit the rectangular end of the faucet (see picture below).
Short of replacing the faucet, how would you deal with this? Can I build myself a custom aerator? If so, how?