Simple electronics projects

I could not get enough (or not utilized ) time to do electronics experiments in my B.Tech course . I studied lot of interesting theories of the basic electronics,op-amps, Markov chain (http://en.wikipedia.org/wiki/Markov_chain) , signalling of telephone networks.Today I searched for some hobby circuits and projects in electronics.I found two interesting sites http://www.hobbyprojects.com/ and http://ourworld.compuserve.com/homepages/Bill_Bowden/.