Check out this link
There are 12 different challenges for the forthcoming year and the first one for January is NO IMPULSE BUYING. Simple enough? I dont know but I can be awful for going to the shop for one thing and coming back with a bag full. On another site I post on there was a challenge last year not to buy anything new for a whole year. There were guidelines which covered essential items such as food and underwear and other stuff but generally you couldnt buy anything new for the whole year. This is not something that I could do, however I thought that if I could start of small and not buying anything on impulse for one month then this may well snowball into other habits been broken and not only saving money but saving the planet along the way. Check out the link and see what you think.