Rule 1: The weirder the better.
That's my philosophy when it comes to cooking. Bubbling science experiments are welcome in my kitchen. I have kombucha brewing on the kitchen counter, ginger beer fermenting on the dining room table, and three different sourdough starters bubbling wildly away.
Rule 2: Keep trying new things.
I love visiting different ethnic grocery stores where I typically wander through the produce department and toss anything I don't recognize into the cart. Again, the weirder the better. Some of these strange vegetables and fruits have turned out to be delightful. Others, like the bitter melons I bought at Sorya's Asian Market, were interesting. But I am never afraid to try something new.
Rule 3: Never use a recipe twice.
There is no such thing as a recipe. I am constantly substituting ingredients, adding new flavors, and improving, or possibly ruining, recipes. But that is the fun of cooking. A pinch of this and a dash of that keep cooking fun and exciting. Not to say that you can't make your favorite dish more than once. But always try a new twist. Maybe it will be delicious. Or maybe it won't.