At the moment it isn't possible to add a personal message to an order nor is it possible to gift wrap orders. If you would still like to send the order to someone else, as a gift you can of course simply add the address of the intended receiver instead of your own.
Attention: bear in mind the receiver will not know the package came from you. There are no prices mentioned on the receipt accompanying the order.
Tip: send a fun email with the track and trace code to notify the intended receiver! That way they'll know what's coming and who it's coming from.