I'd forgotten about this; Steve Clayton blogged in early January that KLM were offering two custom luggage tags where you could upload your own image and it would be printed on the tags. When I got in today there was a KLM envelope waiting. Having never flown with them I wondered what it was and luckily, instead of dismissing it as junk mail and throwing it in the recycle bin I opened it. Lo; this awaited;
Don't steal my luggage damn you.