You can build the Wee Blinky kit using incandescent bulbs instead of the supplied LEDs. Just omit D1, D2 (the LEDs) and R1 and R4 (the current-limiting resistors for the LEDs). Connect one lead of an incandescent bulb to the bottom lead of where the LED was supposed to go, then the other lead to the bottom lead of where the resistor was supposed to go. Repeat for the other side.
Here is a YouTube video using 12V incandescent bulbs:
It gives a very warm, retro look to the Wee Blinky! Let me know what you think.