We like:
- Bright colors
- Gradients (like the new firefox logo: https://www.theverge.com/2019/6/11/18661931/mozilla-firefox-logo-new-design-more-fire-less-fox)
- or Blend modes and transparency: https://digitalsynopsis.com/design/colorful-overlay-signs-icons-logos/

We also prefer for it to contain an actual logo, not just text, this can be anything, like an animal or something abstract.

In the example logos, we especially like the Blendjets bird (but the logo doesn't have to be a bird, we like the design of the bird)

getinspired