I'm working on making my own blinky now that will run along side a xenon flasher. Thinking of mounting the LEDs just under the saddle

Created a circuit that alternates flashes between two banks of LEDs (plus one acting as a protection diode). Will scale up to a whole lot of LEDs; Im planning to use about 20.
Pretty basic stuff, few transistors and a 555



Video http://www.youtube.com/watch?v=tcUDzX6UaQY