These are a few examples of soaps I found on Etsy.
Some are so beautiful that it would be a pity to use them and see them disappear! I'm sure they smell great too, but unfortunately this doesn't show in photos...So I will judge only their decorative function.
This one looks like a Mondrian painting and will look great in a modern bathroom...
New York Soap by Kokolele (USA)
But even a white soap can be interesting:
Snowflake soap with glitter by Mandala Rain (USA)
There is also a perfect copy of a Rubik's cube...
Rubik's Cube soap by Digitalsoaps (USA)
But maybe a soap with a Celtic knot would be more suitable if you wish a more classic look
White ginger and amber soap by SymbolicImports (USA)
Or maybe some flowers...
These soaps contain real lavender flowers and poppy seeds, for a natural exfoliating effect. They are less decorative than the previous ones, but they have a wonderful colour and guess they are very perfumed
Handcrafted lavender and blue poppyseed soap by Herbal Myrtle (UK)
A category apart are felted soaps, that consist in a bar soap inside a felt layer (that remains after the soap has been used) ... I especially love this one with Sherlock Holmes
Sage and lemongrass Sherlock Holmes felted soap by SoFino (USA)
Others are abstract and offer a selection of colours and scents
Red grapes and pomegranate felted soap by Magda The Sheep (Italy)