I'm resigning soon, any suggestions what to build on my own?
Kaizyn: Seriously, do not quit your job UNTIL AFTER YOU HAVE YOUR KILLER IDEA!!  Apologies for those who can't stand the all-caps.  If you have a good job now, what you should do is move to a cheaper place to live and get your bills down to as low as possible.  In the meantime, do some market research and really think about what kind of business you want to build or what kind of service you can provide.  For this to be good, it needs to accommodate both your needs for doing something you enjoy and the needs of being a realistic profitable business.  To do this well, you will want one to two years worth of savings in the bank, not a couple of months!  Best of luck to you in this endeavor.