i dont see why not!but you may want to wire them up to the switch and use a different power source rather than running them straight off the boot light, deppends how many your thinkin of fitting!? just a thought.
I presume you have an amp in your boot, if so, run the power from there into a relay, use the boot light to give the input signal (switch). Obviously putting the output from the relay to your neons...
hmm just tried them off the boot lights but the neons wont light up, however the power supply is reading 12v, i have tested the neon straigh of the battery and the neon works and ideas?