tv_colrot plugins are webcam displaying plugins. They all are based on same algorithm rotating through color values of webcam video, and displaying only part of the colors. By default they work in overlay + lens mode, so that under those plugins you may have other effects running unaffected.
tv_colrot is basic form of plugin.
tv_colrotslow is bit slower version of plugin, more suitable for slower music.
tv_colrotbeat is audio reactiong version. Colors are rotating only on beat, and speed of rotation and amount of colors shown depends on volume. For stronger effect, try changing volume scaling up.
Colrot plugins have been available since version 3.32