Online retailer Cartridge Save http://www.cartridgesave.co.uk/ has set up the'The Alties' competition. Entrants are to script an alternative ending to a favourite film. The grand prize is £2000. There are runner- up prizes too.
For details of How to submit your entry, t&cs, and categories etc visit http://www.cartridgesave.co.uk/thealties
Two ways to enter: either by email to firstname.lastname@example.org or post your script to Alternate Endings Competition, Democracy, 62 Beech Road, Chorlton, Manchester M21 9EG
Here is a link to Buzzfeed which lists 129 iconic cinematography from top films which may help to inspire you with a film to choose and to write up that alternative ending. Good Luck! http://www.buzzfeed.com/danieldalton/there-will-be-scrolling?utm_term=.mkJmdWm5W#.ju28wG83G