Ask HN: Design palettes instead of color palettes?

I've finally become proficient with Tailwind CSS.

However, my sites still look ok. I've adopted the idea of "use different shades gray to make UIs" and, as a result, my sites look... professional but uninviting.

Consider sites like:

- https://curius.app/

- https://www.notion.so/

- https://www.focusmate.com/

These sites look warm and inviting. Being proficient with Tailwind CSS just helps me have good padding, margins, and a reasonable default color scheme. It doesn't help me make my site look... human.

I feel like I need a "design palette" instead of a mere "color/margin palette". What's the recommendation for this?