A whole host of famous names have designed envelopes to raise funds for the National Literacy Trust. Author Mark Haddon has plumped for a colourful porthole effect.
Pop group JLS have added a patriotic centrepiece to their signature-splashed design, one of the many up for auction on eBay from 2-12 November.
Actor Roger Lloyd Pack says the words he has written on his envelope "resonate powerfully whenever I see them printed".
Singer Ms Dynamite's intricate design contains the words "be free, be happy, love is the only solution, just love harder".
Radio 1 DJ Fearne Cotton's cute doodle sums up her good times - the other part of the design is a darker reflection of her bad times.
Welsh artist David Bellamy has highlighted the threat to the environment in his watercolour design.
Actress Jenny Agutter's delicately-coloured envelope is based around Shakespeare's Sonnet 116, which she says was read at her wedding.
Stramash - the Scottish word for a commotion or uproar - is at the heart of Newsnight presenter Kirsty Wark's bold design. The theme of year's Pushing The Envelope is words that mean most to you.
What are these?