Kroneck recommends varying the locations of your light sources. Bunch Christmas lights on the ground and cover them with dry leaves, or surprise kids as they turn a corner with a blast of light that's at waist height.
Light bulbs that recreate flickering flames are less than $10 for pack of 10 on Amazon. Dahl likes to group these on window sills, where the reflection from the glass creates crazy shadows.
You can buy colored bulbs easy enough, but Kroneck says it's just as effective to pull sheer fabric over your existing bulbs: "You can even use old boxer shorts, the plaid creates weird colors." Just make sure the fabric is far enough from the bulb to avoid heating up.