In case you are interested in seeing a Pixy2 LEGO robot in action, here is a video link for a performance in RoboCup Junior Internationals in Sydney this year. The Australian team I mentored added the Pixy2 late in their performance to great effect. The Swedish Chef is a LEGO EV3 robot with Pixy2 attached to follow the yellow rubber chicken. The chicken was mounted on a dolly to make it easy to move around smoothly but also includes a black background behind the chicken to reduce false-positives. This was a good workaround to reduce risk in their performance but perhaps could have been solved without the need for the background if they had more time to investigate this.
Link forwarded to point where Swedish Chef chases the chicken: