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Anything is cool for a display (7seg, lcd, vga, laser projector, pov) and ssl to a Unix box. Add a keyboard and you've got a server interface.
It would be interesting to see if this is possible. Use an ATMEGA8 and ESP8622. The two tricky parts are interfacing with a large enough screen and getting the keys on the device. Keys could be managed with an sd card. I found 7" screens for $15, but they don't have a driver.