Best gifts for a commuter cyclist?

My fried got her bike custom made a few months ago and is excited to keep it for years to come. She cycles to work, about 6.5km each way everyday and is maintaining her bike regularly by greasing the chain amongst other things. What do you suggest as a good bday gift for her? I thought about the Silca Chain Waxing System, but is wax better than grease for the chain? Is it easier that greasing the chain without taking it off the bike or more of a way to treat the chain and not make as much of a mess? Let me know what you think!