Here is a very simple capacitive power supply circuit, with triac connected across its terminals. Triac will be triggered with negative impulse.

References for power supply and triac control: http://www.st.com/content/ccc/resource/technical/document/application_note/a8/00/35/e2/62/e5/4c/14/CD00266635.pdf/files/CD00266635.pdf/jcr:content/translations/en.CD00266635.pdf

And a very very lazy 10minute implementation :-)

Next step: microcontroller to detect zero crossing and trigger the triac. Lets see what happens next...

Stay tuned :-)