Here's A Good Idea: Journal of Non Spending
Keep a journal of things you don't buy. Just jot down the date, what it was, and how much it was. Keep it simple and fun. Use a spreadsheet if you are on the computer alot.
When you go to the store or get on the internet or go out to eat and you feel like buying something...but you don't buy it...then write it down.
You'll get satisfaction when you add up at the end of the week the money you didn't spend.
Of course the most important number is not what you don't spend but what you DO spend.
Happy Not Spending!