For a fun look at how Daniel sorts the Hot Wheels cars at church, see Jessica's blog. She loves to find things that come in every color, so when I saw the cars lined up according to color, she is the first person I thought of.
Do you need to make an online purchase? If so, do not proceed until you go through ebates.com. Sign up for free (with a $5 bonus) and start earning little rebates each time you make a purchase online. Most stores you would ever need are available (with the exception of Amazon). They mail you a check about every 3 months. When I signed up a couple of years ago, there was a $10 Target gift card bonus and they mailed it within a week. Different stores have different rebates and they have different incentives from certain retailers. I have ordered from Dell, Expedia, Ebay, Restaurant.com, Old Navy, Sephora and more! Just ordinary online shopping has earned me about $100 in free money each year. Follow "my" link below and sign up! It's free!
Tracy's Ebates Link to Sign Up
The hard part is remembering to ALWAYS go through ebates.