I've tried a lot of different microphones from the kinect, modified baby monitors, CAD U7, conference mics, wall switch plate mics, headphones, Bluetooth mics, and I always seemed to have issues with them aside from a headset microphone. But the other day I found a couple of these old receiver surround sound configuration microphones.
So Tiny
Integrated it right into the armrest of my couch, its at a great angle for capturing my voice. I can be anywhere in my room speaking at a normal tone and it picks me up with great accuracy.
Almost every surround sound receiver ive ever purchased came with one of these microphones. Not sure if i just got lucky with the quality this thing works at or if they are all similar in quality but if you have one lying around and need a discrete microphone definately give this little guy a shot!