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Looking to build some of these on the cheap.....

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Well, went to Walmart and bought 2 cheapo yard lites and then stopped in at Radio Shack and bought 2 blinking red LEDs. Replaced the LED in the yard lite with one of the blinkers but it doesn't (blink).... Maybe not enough juice from the single AA battery?? LED package says 2.5-5VDC supply voltage. It lights but doesn't blink.

So try adding 100µF or more electrolytic capacitor in parallel to the boost circuit output going into your blinking LED.
 
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