How to wire two 555s in parallel?

[bmachine]

Hello.  Newbie here.

I read with interest the article by John Adams about using a 555 as a timer

I am trying to build a controller that would activate a relay in a "non regular" way.  In other words, when I use the astable example John gives, depending on the values used, the circuit will give me "on for 1 sec, off for 2 secs, on for 1 sec, off for 2secs, etc...".  This pattern repeats until power is turned off.  What I would like is to get an irregular pattern such as "on for 1 sec, off for 2.7 sces, on for 0.8 sec, off for 1.4 secs, etc..."  I am not too picky about the actual intervals, as long as it appears more random. 

I was thinking that I could run two 555s with one set for one timing (1 sec on and 2secs off for example) and then second one set for a different timing (1.6 sec On and 1.3 off for example.  I would then take these two outputs and combine them to get a more irregular pattern to trigger my relay.

My question is How do I combine these two outputs without getting overloads or feedbacks or whatever dangerous thing might happen if I simply connect them together before going to the relay.

Or maybe there is a better way to achieve this...

Any help would be greatly appreciated.

Thank you

Bmachine.

[audioguru]

Two 555's cannot be paralleled, but Cmos inverters can.
Here is a circuit to randomly flicker an LED's light. Change its capacitor values to slow it down and maybe it will be OK for your application.

[bmachine]

Thank you very much for the answer and the schematic Audioguru. 

At first the file wouldn't open so I found a link for it here (hope it's OK to post links):
http://members.shaw.ca/novotill/FireLightFlicker/index.htm

I will give that a try.

Bmachine.

[hotwaterwizard]

How about this?

http://home.cogeco.ca/~rpaisley4/LM555.html