WC pans; there are 2 options for the cisterns; visible & fitted to the back of the pan, or concealed, either in a unit (as above LH) or boxed in. If concealed thought should always be given to access to allow for servicing. The photo bottom right shows a freestanding WC with a close coupled cistern, this is very much a Voysey period piece, with an oak seat. The photos above right & bottom left show BTW (back to the wall) WC's with concealed built-in cistern units. The photo above left shows a built-in WC & BTW pan. I'm sure Voysey would have chosen the simple clean lines of a BTW pan & concealed cistern, with either a shaker or plain front panel behind the WC.
As well as using a white WC seat you can also use an Oak WC to match the bathroom furniture. You can have light oak or medium to match the colour of your furniture. We couldn't resist adding the Heart shaped WC seat, above right, lovely kitsch.