There are so many gorgeous knobs, what about something to add a bit of personality and fun/joy to the kitchen. Easy, simple and fairly low cost to play with. All the same, different but co-ordinated ones, alternate ones ... http://www.ebay.co.uk/itm/Multi-coloured-ceramic-knobs-drawer-pull-cupboard-door-knobs-porcelain-china-/281241082642?var=580285132418&hash=item417b465b12:m:m-VBL7PkycruyxaWl0qihJg http://www.ebay.co.uk/itm/Ceramic-Door-Knobs-Handles-Drawer-cupboard-wardrobe-porcelain-china-pulls-/310630047875?var=610179807491&hash=item4852fe6083:m:myhVxaODYrgIIljMoguLYoQ Not saying it has to be one of these, just examples to open up the options from the more traditional, slightly more masculine ones ...

I was also looking for hex knobs recently (for different cupboards) and found these. Haven't ordered them yet, but the seller has excellent reviews. https://www.etsy.com/uk/listing/581840248/luxury-modern-metallic-brushed-brass Also they have this variety which looks similar to one of your other desired examples: https://www.etsy.com/uk/listing/607100871/modern-brushed-brass-copper-gold-or

They're very pretty, reclamation yards or somewhere like this may be able to source one https://www.belowstairs.co.uk/acatalog/Online_Catalogue_Door_Handles__Knobs___Pulls__59.html, but I think you may need to get one made to match.

Could you add photos or a link of the style you’re after. You can add to comments under here. How about these: https://www.handles4u.co.uk/products/Cabinet+Furniture/Cabinet+Knobs/Square+Cabinet+Knobs/Black+Square+Cabinet+Knobs/Augusta+11035393+Cabinet+Square+Knob+Handle+30mm+Diameter+Matt+Black/2620602285?gclid=EAIaIQobChMIr_W_5bL23QIVRbDtCh0_fQB5EAQYGCABEgK25PD_BwE I google searched for matt black cabinet handles. There’s also a cup handle to match.