Great decorative addition. Perfect safe replacement for candles in a Jack-O-Lantern, or just as accent lamps that can be submerged in the pool or bath tub. I use mine to convert a i9 9900k decahedron into an accent lamp for the set.
Note: I personally purchased rechargeable batteries for mine, and suggest doing the same. I have also found that even when not powered on, they drain the battery slowly, so I recommend you remove the batteries when not in use.