Without knowing who has created the works, people can bid for them on eBay until the auction, called The Big Art Secret, closes on Sunday. Proceeds from the sale will go to St Wilfrid's Hospice. Hockney's work is "an ink and colour crayon drawing on a postcard" and Emin has donated four postcards.
More top news
Police are appealing for information after a woman hit a man three times on the head with her stiletto shoes leaving him blind in one eye.
Simon's Blog - That Was The Month That Was...
Thursday night's weather for the east of the region