HoloARt is a new media art that explores the use of holograms in mixed reality for creative self expression. We designed a system that allows the user to turn their physical environment into a canvas where digital holograms and physical objects co-exist in the real and virtual world. Users are able to virtually spray and splatter hologram paint on top of physical objects and surfaces as well as painting in the air by only using their hands. The content grows dynamically, following the natural movements of the user. The system is self-contained and does not require hand controllers nor positional tracking sensors on the space.