The first step to a new kitchen that really works for you is to make a list of what is not working in the existing kitchen. List all the elements that are worn out and need replacing. List appliances and counters that are in inconvenient places. If the kitchen area is too small, look for areas that it can expand to. Maybe it is next to a formal dining room you never use, or a living room that is too large and can give some space to the kitchen and still serve it's function well. The wall between the kitchen and living room can be replaced with an open counter space. For structural changes like this, you will need a professional contractor.
Or, you can go in for standard rectangular box shaped kitchen cabinets but can customize the doors is in such a manner that the shape of the cabinets inside is simply not decipherable from the outside.
If what you desire is just some additional space in your kitchen and not giving much priority to the cabinets design complementing your existing furniture then maybe the "stock" cabinets would be suitable for you. These are standardized cabinet units that come with a preset measurement, perhaps not fitting perfectly into your space. But this is a rather simple solution although they could come in fewer kitchen cabinets design to choose from, hence the possibility of being odd among your present furniture.
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