Let's keep things simple this week. When it comes to personal-care products, we are big believers in streamlining what you use—see "Eight Products You Think You Need But Don't" for a refresher—buying less in general, and getting creative. We have both always loved experimenting in our kitchens and our bathrooms, checking ingredients in products we love, isolating the main ones, and then trying them on their own. Sometimes it works: A favorite hair leave-in contained aloe, for example, so one day we tried aloe alone and found that, lo and behold, it worked just fine on its own. And sometimes it didn't. Over the years we have tried dozens of DIY beauty recipes to find ones we like—and that work. Below are our favorite six. And the best thing about these is that none contains more than four ingredients, and chances are good you have them all in your kitchen already. So get cookin' and if you have your own, be sure to share it in the comments.