Is this a recent kitchen installation? Could you ask cabinet maker to adjust the base units across to close the gaps up a bit more? Even if the splashback needs to be re caulked, better than trying to infil with stainless steel angles.

I think that would look great with floorboards in a classic walnut colour, that would definitely look great with the light cabinets. If you want an idea of how it might look with the end finishes, you can type this into google and they should be able to show you a few.

You need to remove link it's got your address on it.

It looks pleasant enough , and personally I'd keep the benchtop as I like the warmth of the wood -- a bit of age and wear adds to the character IMO . I wouldn't glue anything over tiles -- I'd chisel and sand and get a decent base , as I'd be worried moisture , bacteria , food waste would somehow get into the grout and gaps etc , even if you put skirtings around the edges . Mind you , I prefer tiles , be they square or subway or modern with metallics , they seem more interesting than a coloured piece of glass ( splashback ) , even if tiles are potentially more work . Maybe I'd just update my tiles , but I'll want and see your new photos .