  Twisted light has recently gained enormous interest in communication systems.
Thus far, twisted light has not yet been utilized for visible light
communication to transmit data. Here, by exploiting the color and orbital
angular momentum (OAM) degrees of freedom simultaneously, we construct a much
higher-dimensional space spanned by their hybrid mode basis, which further
increases the information capacity of twisted light. We build a new visible
light communication system using a white light emitting diode, with red, green
and blue (RGB) colors serving as independent channels and with OAM
superposition states encoding the information. We connect our conceptually new
RGB-OAM hybrid coding with the specially designed two-dimensional holographic
gratings based on theta-modulation. After indoor free-space transmission, we
decode the color information with an Xcube prism and subsequently decode the
OAM superposition states with a pattern recognition method based on supervised
machine learning. We succeed in demonstrating the transmission of color images
and a piece of audio with the fidelity over 96%. Our point-to-point scheme with
hybrid RGB-OAM encoding, not only increases significantly the information
capacity of twisted light, but also offers additional security that supplements
the traditional broadcasting visible light communications, e.g., Li-Fi.
