I first made one of these Get Well Soon boxes for my mother-in-law and she kept the Get Well Soon banner up for ages (perhaps she wanted everyone to know she'd been ill ....?).
The box includes a banner and a little flower
as well as a bar of chocolate because you can always manage a little bar of chocolate.
You could always add an iTunes card (or any sort of gift card) if you want to really cheer up a poor invalid.
This box is now on my website http://www.daisyleyboxes.co.uk/.