I acted as follows:
1. First I wrote a list of necessary controls (button, input field, breadcrumbs, etc.)
2. Then I found all the design systems that I find visually pleasing. Along the way I checked which of them had repetitive controls that were missing from my list. And added them.
3. Then I assembled a moodboard for each control (these are screenshots of different variations of each control from each design system).
4. And drew them one by one. It's not hard to do when I have all the patterns in front of me.
But I have a serious advantage - I'm a designer. I learned the visual skills at different offline courses (we have great people in Russia who can teach great things). Perhaps if you clarify the question, I can help with a much better answer!
You can see what it includes by clicking "See preview". I spent several months creating this monster. As my research has shown, this is the biggest commercial UI kit.
