How about drawstring bags for presents - like a bag to put a bottle in - saves on wrapping presents or a larger sack for bigger or boxier present - people seem to buy the paper bags instead of wrapping paper and you could put a card on the drawstring.
The other ideas sound good - I am always buying fridge magnets and bookmarks - particularly if they are a bit different. Maybe you could charge a bit more if you personalise them by writing the persons name on them.
Good luck