How about THIS -- running an emulated version of the old IBM mainframe system OS-MVS on a LAPTOP -- the TSO terminal is emulating a 3278 IBM terminal which actually had 4 colours !!!
(If you want to try this download the HERCULES emulator and the MVS system from the " MVS Turnkey" project -- this was the last "Unbundled" IBM mainframe release where everything has been put in public domain). Any old IBM Sysprogs out there.