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Remember that if you set up the LEDs in series, each LED will drop about 0.6 volts along with the resistor drop. I'm not quite sure off the top of my head what a 555 can drive current wise as well, you will have to watch how much current you're trying to source as well. I would use a single 555 timer driving some BJT's and put the capacitors in the base leg of the transistors, may have like 10 BJT's each driving 5 LED's. I know you want the blinking to be random, but you can also use flip flops to divide the 555 frequency how ever you like.
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