Working circuit needs more current
The current through the LED is limited by the "22R" resistor.  Lowering the resistance value will increase the current and thus brightness.  make sure the PNP transistor is also rated for the current.  A "darlington pair" of transistors has a much higher gain and can be used for higher-current applications.

Current will be (6 - 2.0 - 0.2) / R.
- 6v supply
- 2.0v (approximate) drop across a red LED (blue may be up to 3.3v)
- 0.2v drop across the collector/emitter transistor junction

The cycle time will be a function of the 10u capacitor and 22R.  Lowering the capacitance and/or resistance will make it cycle faster (I think :-).