You can get flat panel plasma displays from 40-60" in size. They're normally XGA or so resolution, which is great for airports, but I don't think it would look all that great in your home as the dot pitch is so large. If you can afford a couple grand per display, though, shoot man, go for it!! You'd have to drive them from a PC, as these are strictly displays- an old P3 sitting in the back room with a handful of PCI video cards ought to be able to run several, or you could put together really thin systems for each one and hide it between the studs.
Pentium IV 2.4C Northwood- M0 stepping @ 3.2GHz HT
Air Cooled w/ SP-94 heatpipe & 92mm Vantex Tornado at 45C
4x256=1gb dual-channel 2-3-3-6 OCZ PC800DRAM @ 890MHz 3-4-4-8
MSI Neo2-PLS w/I865PE & SATA @ 4x267=1068MHz
BFG GeForceFX 5900@485/967MHz = 6284 3DMark2003s; dual-head 21" CRT & 19" LCD