Google Forms

• Simplicity in design, keeps limited options available to users that likely cover the vast majority of needs.

Trello

• Intuitive interface, you can pretty much guess at how to do things and you'll probably be right.

https://www.theguardian.com/news/series/ten-best-photographs-of-the-day

• High-quality content, appropriate focus on what matters, leads the user further into the site

Pandora

• Very simple interface to get exactly what you want

Adobe Color Explore

• Like pandora, very simple interface to get what you want. Puts the important content up front.