Check out these cool “brain specimen coasters” bet you could do some cool cross sections on clear acrylic stacked up(or even maybe glass).
Could look even better if you can do 3D engraves with greyscale to each layer of acrylic. Even better yet if you have some hand artistic skill, you could pain the linside of each engrave, I have no hand artistic skill but I’m sure I’ll try this and then dying the inside of engrave, maybe dry brushing or using different thinkness ink would leave more/less of a relief so you could quickly/easily get a multi-coloured(not rainboiw!, well now I mention it, rainbow!) design on the inside.
Cross sectioned body, or your favourite video game monster anyone?