In the last weeks I found the following three interesting topics:

First, there is DrumPy by Maurice Van Wassenhove. It is a result of his master thesis and shows a gesture controlled drumkit, so it addresses the same idea as lalelu_drums does. There is a demo video showing a basic drum pattern.

Second, there is Odd Ball. It is an elastic ball that features sensors and a wireless connection to a mobile device. It can be used to trigger sounds based on the movements of the ball, so it allows performances similar to those that I envision for lalelu_drums.

Third, I was pointed to the 3D drum dress of Lizzy Scharnofske. It is a wearable device featuring buttons that Lizzy uses on stage to trigger sounds. So again, the idea of the performance is similar to the motivation of lalelu_drums.