Hi Matteo,
I invite you to look into the LIDAR datasets we have collected at NEON (http://www.neonscience.org/data-resources/get-data/airborne-data). All of our LIDAR datasets have been colorized with RGB imagery (using lascolor) and are freely available. We primarily collect data over natural landscapes if that is what you are interested in for your art project. We can deliver the data electronically and it will come in LAZ format. If you are interested you can request the data here:
http://www.neonscience.org/request-airborne-data
The original orthophotos are also available.
-Tristan Goulden
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