Hey G... have you used any of the self flashing LEDs from Evan's Designs yet?  Something I've found in lighting my kits is that they are great for making random flashing patterns for consoles and the like, and if you need a set flash rate for several, just hook one up to a few fiber optics.  They are pretty easy to use and work with.  They are all presoldered with resistors and 28 gage wires.  Can get them in sizes ranging from Jumbo to Pico size.