Christmas is coming, I'd like to push some SIMs out for points for the new year.
A nice idea would be a fresh 'Christmas' themed envelope as a stocking filler 😉
Possibly with a message on the cover before opening;
"Your cared for. Cared so much about you've been invited to GiffGaff, the low cost mobile network which is free to talk and text between Gaffers. Open up and view prices. We promise, no contract. Leave when you feel like it. Happy Christmas x"
Another idea would be if multiple are being ordered, packed into a single envelope with the address on, then they come with a black area on the front for their name 'tag'. Meaning their isn't an address on it.