Graze
Graze (www.graze.com)offer yummy boxes of fresh fruit, nuts, and snacks in the post for you to nibble on and get your 5-a-day and....well, healthy stuff. They've always got offers going on, and if you sign up your first box will be half price (usually £3.99). Give out your special code and you'll also get a hefty discount every time your friends/family/followers sign up too.
Image courtesy of Flickr user: batmoo