Just because you have a small bathroom doesn't mean you have to have skimp with small furnishings. You can still design big in small spaces. The biggest feat in designing for a small bathroom is saving floor space. One of the most common tubs used in small bathroom designs are corner bath tubs. Many small bathrooms will use a corner bath tub to help gain some floor space and use walls to anchor the bath.
A misconception in designing for a small bathroom is that you have to compromise on your aesthetics but this shouldn't be the case. There are plenty of products to choose from out in the marketplace that has the sophistication and luxury of a larger bathroom yet are smaller in dimensions. Corner bath tubs that are drop in take up more space because of the surrounding decking, so the partially skirted variations are better on saving space.
Custom made freestanding tubs are a great alternative if you don't like the look of corner baths. Measure the size of the area you are wanting to place your tub. A custom bath tub builder will be able to fabricate their tubs to your required measurements. A free standing tub will give the space a more modern feel.
This free standing Victorian tub uses every inch of space possible in this bathroom design butting up against both walls. By custom designing the tub, you will gain more footprint area.