Light touch/no touch switch

I'm looking for a switch (Logic level I guess) that would require little or no physical contact and wouldn't be easy to accidentally trigger.

Maybe a proximity sensor or capacitive button? I can't seem to find any simple off the shelf solutions or either I'm not searching for the right thing. It needs to be really small and light.

Thanks.

What about something like this?

http://bildr.org/2011/05/mpr121_arduino/

or this

or this