Freezer Fail Detector: Here's a simple one: what happens if your power goes out while you're on vacation? Well your food will thaw, then go bad, then refreeze, and you'll be none the wiser when you go to eat it. The freezer fail detector is just a jar filled half-way with water then frozen on its side. Put the jar upright and glance at it whenever you open your freezer. No more salmonella!
Use any glass jars (from store bought sauces, pickles, olive jars, jams, even baby food jars as long as it has a twist on lid) to store things under shelves or cupboard! From herbs & spices & sugar in the house to nails & bolts in the shed.
parmesan cheese containter lids will fit on mason jars! How about keeping baking soda by the sink for a mildly abrasive cleanser. Or flour near where you kneed your bread - just sprinkle on the counter.