There are modular dot shaped led matrix blocks that are basically LEDs under a cast piece of resin that guides light. They're tillable and you can drive them wi

There are modular dot shaped led matrix blocks that are basically LEDs under a cast piece of resin that guides light. They're tillable and you can drive them with an FPGA and a smart shift register based constant current driver. They're generic so you can look around online. For example: https://www.jameco.com/z/SBM-2388ASRG-RG-Super-Bright-8x8-Dot-Matrix-LED-2-38-Square-Bi-Color-Red-Green-5mm-Dot-Column-Cathode_2306311.html https://www.jameco.com/z/SBM-2388ASRG-RG-Super-Bright-8x8-Do... However this is assuming your installation will be reasonably large. If it's too big, I recommend making your own array out of discrete LEDs. They sell LEDs with a built in milky diffuser that are suitable.