Here's a thingy that I've been fooling around with for a while.  It's a 74HC14 TriCORE that gives you some interesting results.  The caps are .22uF and the resistors are 1M.   

You can get three basic states from this configuration.  1,0,0; 1,1,0; and a really neat 1,1,1. 

I drew the schematic like this for artistic value alone.  No other reason than that.