Just get one of those backpack weed killer sprayer, fill with napalm, ( gas+Styrofoam), attach butane mini torch to the nozzle, and it's the "fire shovel" TM.
We're veering off topic here, but I would like to say, it would be neat if when you got a sidewalk, you had nichrome wire embedded in it, so if it snowed, you just hook your sidewalk up to a car battery and it warms up. Well, maybe you'd need somehting more than a car battery.
Don't put lithium in these. It will over-drive the led a LOT. I have one of these, and I use it quite often. It's picky about operating voltage though. Alkaline voltage drops too fast, and drops even further under this heavy load. NiMH is okay if you get a good one, but NiZn cells are the best for these boost drivers because they are closest to the optimal operating voltage.