These muted tones are sampled from some miniatures I photographed at a model train expo last year. When seeing the Tetrad option on the Real Colors app, I loved the soft color options and felt they were something akin to poker table felt tops.
The colors are a calming effect overall, and each time can reflect a different sensibility. Greens can be nature, blues give some kind of financial strength or intelligence, the pinks have an innocence or gentle approach.
These are great starting points for approaching color in a logo design. What attitude is your brand? Who is your audience? What is your message or tagline? Color adds that extra bit of personality to your brand.
So give these colors a shot! Chip in and let me know what these colors say to you!