My wife asked me to make her some Netflix socks. I did make one but the IR part never quite worked right because our TiVo is located up too high and, invariably, Kathleen would fall asleep with the IR blaster tucked under the covers. But, eh... it was a silly project and I love silly projects.
While building the socks I constructed an IR capture and playback tool to help me program the blasters (I archived the random firmware I wrote on GitHub for what it's worth). The thing is built around an ATTiny84 clocked at 20Mhz to keep up with the IR bitrate. The device had three modes:
1. Detect - Simply blink when any structured IR signals were detected.
2. Capture - Record an IR signal.
3. Replay - Emit a captured IR signal.
While I never got the replay to work quite right I am proud of the h4x0r aesthetic the hand-built device ended up with.