Hello haylescakes, I think it just need a bit of care.. I would definitely not mix it.. Granite, like Marble or any other luxury stone, even woods do need some attention.. I have bamboo and that too requires a bit of effort.... Wiping down and a regular re oil.. However I think it is really really worth it. Also it does last and would definitely look all the better for the little bit of effort.. I also made several chopping boards with off cuts!! Gr8 way to use up the material and useful too! For colours I would look to finding something lighter than black.. I think you could really go for something amazing... Firstly though think of the colours in the kitchen... If it's a blank canvas, so to speak and any colour would work... Ie you have white worktops... Then really go for something striking... I have just found a few colours from a company online that are quite interesting..I'd say do some research into pricing and ask for samples.. Or visit a showroom to get an idea... Get as many samples as you need before deciding.. I think the more natural looking as possible... Some of them can look manufactured.. You could also add a small splash back panel.. Narrow is quite tasteful, the have a really chalky matt paint on the walls and matt paint for the cupboards..... Lastly think of finish.. squared off edges are in my eyes more tasteful.. but you can look at that and decide what you like the look of :)) Cosmic black... Siena BordeauxVerde MarinaceKinawa

My initial reaction to the photos was that the kitchen units' colour somehow didn't quite 'gel' in the room and I was rather hoping colourhappy would come in and be able to cast her professional eye over it. I still really like the granite and I agree that at least changing the lower units will work. Perhaps the upper units need changing too? J Pleass, would you consider doing that?

I think if you are going for that floor (which is lovely) and pale cupboards then a darker worktop is a good idea, perhaps not black though. If you want for a deeper stone coloured cupboard then white or off white worktop would work well. That would be my choice. The light would bounce off the worktop and the cupboards a deeper warm colour would prevent it from looking insipid. https://www.floorsofstone.com/blog/a-perfect-partnership/

I don't think the weight will be an issue as long as it is not a very finely supported island. If you require castors then make sure that the legs are straight not turned to a bun foot like your image. You need as much leg as possible to fix the castors. If you go for a 20mm thick marble or slate top you will not have a problem with weight or moving it. Get the castor type with brakes so that you can lock the position once you have the right spot for it.