You might want to consider some CMOS low power internally linked shift registers, to give a pseudo-random variable flash rate.
It puzzles the heck out of my squirrels, when connected to a motorised table. They can manage up to 3 bits of this "Simon" memory game, correctly jumping to the table at the correct time. But not 4 bits.
There are some nice hints and tips above which I had not thought of, Such as filing down LED case to extract more light.
Yes! Oh, you are so literal!
But in fairness you are also very correct.
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Another task begging for a cheap microcontroller..... A PIC 12F629 comes to mind. Eight pin chip and it does the LOT.
I was going to thank him for his output. :-)
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