Yeah, kind of tapered would work - shorter at back and sides etc. If he really wants something different he could get a 'hair tattoo' in the side or both sides of a short back and sides style (where a shape is shaved into it.) I saw a guy with very short hair with swirls shaved all over it - looked pretty cool. The hair has to be really short (ideally about 4 or 5mm) or they get lost and don't look very sharp.