This is fun. A firm in the US, Litographs, produces coloured prints (or t-shirts or bags) of the text of classic works arranged as a poster. There are lots to choose from, including Plato's Republic (the Jowett translation). Heffers stocks some of them (though they are quite pricey in £ compared with the $ cost listed on the website). Here's a quick idea of what they look like. To get the whole text you have to buy the largest size (30 x 45 inches).