I had a look online about colour/black and white photographs and when to chose black and white and when to keep colour. Keeping that in consideration, heres some still life photos...

I kept this one in colour, I think it works well because the teapot is yellow and so is the cloth on the right. There is an orange next to the teapot, the cloth on the far left is orange too. Purple contrasts with yellow and the white gives it a base.

I changed this to black and white then messed about with levels and curves on Photoshop to create different kinds of black and white than just the filter effect.

I made this one a lot darker, notice different areas are black and white from the above photograph because of the curves adjustment and how low/high the settings are. It's acceptable to mess around with those settings and get away with it in black and white because you don't know what the colours actually are.

I like this one because of the contrast. I like how one set of flowers in white and one black, the two bottles on each side are black and the two teacups are white, the inner cloth is black the middle one is white and bottom one is grey, it all just seems to work out well.

A different viewpoint with some interesting refections. Kept this one in colour as the focal points are the teapot and cup, which look good together in colour. It seems to work out compositionally in a triangle.

Same thing again but in portrait.

Colour and refection

A more interesting and unexpected focal point of the light behind the flowers rather than the flowers.

Looking through can be quite interesting compositionally.

One of the cloths, slightly more abstract.

Dirty teacup I decided to leave in colour and turn up the contrast slightly in aim to exaggerate the dirt and lighten up the top.

Both candle and teacup have black in the middle and white on the outside so I captured them in one image.

Shadows and triangular composition.

Negative space and colour.