Here's some easy ones that are in line with the type of materials and production techniques you've normally used.
Camera mount platforms to mount from various points on the bike. POV recording is really taking off with the GoPro stuff these days. Most cameras use a 1/4" bolt from the tripod to mount. You may, or may not want to include that part. A sturdy flat surface would allow for some home "engineering" to actually mount the camera.
-- universal mount that bolts under the mirror using the same (or extended?) mirror mount bolts.
-- Universal mount using the grab bar bolts and sticking out the side, or even across the top of the passenger seat.
-- Front axle mount: Rod goes through the front axle with rubber spacers, kept from spinning by hex insert on the right side, a nut or compression clamp on the left side
-- Steering stem hole mount.
One more- a variation of your tiger trunk that has the hooks and latch, but maybe just a bunch of flat surfaces inside to mount various doodads that we're all so fond of. The wires coming in and out can be the buyers problem, but something like an SB-6 or LMA-3 can simply be unplugged from the harness, so those could me mounted in the hump in a pinch. Will leave room for hairspray under the hump.