Start with the wrapping. If this is for someone you love, then make it as showy (probably red ribbon'd) as possible. If it's for someone you're not that find of, then use loads of tape. Aries don't 'do' patience. You'll be hard pressed to keep them from opening gifts until the right moment.
Think 'fast' and whatever you give them, be sure it won't take too much trouble to use and enjoy. Better still, choose gifts that help cut corners for them.
If you must be practical, then give them headache tablets and elastoplast. You're unlikely to go wrong there. If this is for someone you really, really love though, then think something special that's at the cutting edge. Yes, that includes crystal - and diamonds. Jewellery is good but so too are things for their home. Underneath all that Tarzan-type behaviour, there's a little home-bird that needs a nice place to sing and a little comfort food.
So, music's good and so too is easily prepared food. A DVD of a film that makes them laugh or which encourages their adventurous spirit is good too.