If you want to turn HDMI video into art, then you might be interested in my Pixel Wrangler project: https://github.com/osresearch/pixel-wrangler
Maybe you have an old Mac that you want to use as an HDMI monitor? The Pixel Wrangler can do that!
Vector displays are maybe not the best match for the Pixel Wrangler, although it can be made to work...
Character matrices are also a fun challenge for FPGA video processing; the Pixel Wrangler can do this too.
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Booting Linux using the signboard from the side of a train as the display? Easy with the Pixel Wrangler.
@th oh that's sick! where'd you find the signboard?