Disappointed posters here but the 80xs are a very plain train to start with. The Pendolino was built with tardis lights in the vestibules and curvy panels and roofing. There is not much you can do to an IET to make it interesting besides fit good seats to make the ride comfortable. I think the important thing is legroom, window alignment and comfort and the IETs already have the first two figured out, just the third will be improved over time, as the complaints have been loud enough for ToCs (especially EMR) to take notice on that one.
Now I hope Avanti will join the know your train feature on RTT so that I can avoid them when using Avanti.