More "wish you had this?" than "wish you were here", Welbeck Tiles sell gorgeous gift tiles based on vintage Cornish postcards.
Definitely something worth writing home about: stationery shop Present & Correct are now selling packs of vintage modernist postcards.
Sadly spotted too late for Christmas, which is a shame becauase this Factory Records Postcard Set would have made an ideal stocking filler for the music fan in your life.
If you have a pop art lover in your life, An Alphabet by Sir Peter Blake would be the ideal gift.