If you are looking for a turn on wire, you won't find any in the trunk, and as far as holes, hopefully you don't have any back there...
The lights would work... but then you would need them on to turn on your amp. =P
Suck it up and run one under the carpet.
I ran my power and turn on wires down the left side of the car, and my RCA's down the right side. It's not to hard, with the exception of getting power run under the drivers seat.
