A drum'n'bass-style track but played by massed bagpipes and drums (think Royal Edinburgh Military Tattoo). Ok, I'm sure most people would live without the bagpipes, but the drums would be cool; and it would be loud. Very loud.
Mental note: must check that Martyn Bennet, Paul Mounsey, etc. haven't already done this. Actually Paul Mounsey (writer of that music in the VisitScotland commercial - it's called "North" and is on "NahooToo") would probably use a Brazilian percussion group.