This project is pretty simple: send commands via IR based on accelerometer readings (i.e. hand position) and manipulate a CRICKIT based on commands received via IR. Even so, this can be the basis of many different projects. This just controls two motors connected to the CRICKIT, but the same approach could be applied to anything connected to the CRICKIT or Circuit Playground Express.
It could be taken further by adding simple gestures in addition to static hand position. This could be done by examining changes in accelerometer values over time.