Gradientes

https://www.joshwcomeau.com/css/make-beautiful-gradients/

https://www.smashingmagazine.com/2022/01/css-radial-conic-gradient/

https://uigradients.com/#MistyMeadow

https://bennettfeely.com/gradients/

https://cssgradient.io/gradient-backgrounds/

https://webgradients.com/

Usar gradientes para hacer gráficos de tarta:

https://www.sitepoint.com/create-css-conic-gradients-pie-charts/

Animados (muchos usan JS)

https://bashooka.com/coding/30-css-animated-gradient-examples/