Maybe we can get people to design a few Christmas cards?
Use the pixel to create the holly leaves or christmas baubles, a christmas tree, you name it.
I think the main priority needs to be that it is a proper Christmas card, with a tiny logo somewhere on the left- or right-hand bottom corner.
Maybe some spiel about giffgaff on the back, in between the address and where you put your note.
The best ones, if there are any, would get printed and people can request X amount of cards, either for free or a small sum which we give to charity?
Something like that?