Artists Tracey Emin, Anish Kapoor and Yoko Ono have contributed to this year's Secret Postcard sale at London's Royal College of Art.
The annual event sees 2,700 works by professional artists and students sold to raise money for the college.
The postcards, costing just £40 each, will be sold to the public on 22 November following a week-long exhibition at the college.
But the artists' identities are kept under wraps until the work is bought.
Artists and designers who have contributed postcards this year also include photographer David Bailey, Turner Prize-winning artist Grayson Perry, former Clash member Paul Simonon, Wallace & Gromit creator Nick Park and shoe designer Manolo Blahnik.
Professor Glynn Williams, head of fine art at the RCA, said: "We are incredibly pleased with this year's postcards donated by some of the world's leading artists and designers.
"RCA Secret is about securing the future of the next generation of artists and when the public buy postcards at the event they are helping to make this possible.
"It's one of the most democratic art sales in the world - everyone has an equal chance of getting a big name."
The postcards will be exhibited in the RCA galleries and online from Friday until 21 November, before being sold the following day.
All money raised will go to the RCA Fine Art Student Award Fund.
The exhibition was the brainchild of a student of the London university in 1994.
To date, sales of postcards have topped £1m for the fund, helping hundreds of emerging artists.