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This is circuit Single LED GATE Flasher by 4011
Flash = 1Hz , IC 4011 ’s Input pin 1 for Control LED ON or Flasher.
Logic = Low (LED ON) , Logic Hi = LED Flasher.
I like this circuit because it is easy to make.
Detail more, Please read in this image circuit.

Source : Single LED GATE Flasher [...]

IF you want the small circuit two LED Flasher, I show this circuit.
The important part of the circuit is IC 4011 again, I used gate of IC 4011 (see image).
Read more : Two LED Flasher by Gate of IC 4011

This simple circuit uses NAND Gates to alternately flash two led’s. The two 47uF capacitors determine the flash frequency. It is a good idea to use a decoupling capacitor across the power supply. I made this circuit using the components shown and it worked fine. The IC that I used is the 4011 Quad
2-input NAND [...]