I recommend the every-other-row thing over flickering the lights with the 555 chip. There are a number of Caddies out there that have the flicker rate set low enough that I can see the lights "strobe" in my peripheral vision, and it is very distracting on the road. My GF complains that it gives her a headache, as well.
So, for the sake of those of us who are sensitive to that, please use the every-other-row (or similar) solution instead of blinking the lights. Or if you blink them, use a frequency faster that 100 Hz.
-soD
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