Okay - I think I have figured this out and am posting here for other’s reference.

If you are creating a sticker, you can only set the color value to one of 12 specific values:

1. GREY =         "#f5f6f8"
2. YELLOW =       "#fff9b1"
3. LIGHT_ORANGE = "#f5d128"
4. OLIVE =        "#d0e17a"
5. GREEN =        "#d5f692"
6. PASTEL_BLUE =  "#a6ccf5"
7. AQUA =         "#67c6c0"
8. BLUE =         "#23bfe7"
9. ORANGE =       "#ff9d48"
10. PINK =         "#ea94bb"
11. RED =          "#f16c7f"
12. PURPLE =       "#b384bb"

This really should be documented.  Other widgets (like Cards) seem to be able to take a wider range of colors.

Thanks a lot @Steve Appling. You are right, it was missed and we will add to our documentation.

Hey guys, regarding this topic I have an additional question.

Why there are only 12 values available, even if we can set 16 colors from UI?

EDIT:
I checked colors available from UI and in REST API and it seems 7 out of 16 UI colors don’t work through API:

```

  Grey = '#f5f6f8',

  Yellow = '#fff9b1',

  Orange = '#f5d128',

  IntenseOrange = '#ff9d48',

  Lime = '#d5f692',

  // Green = '#c9df56', // Not working

  // BottleGreen = '#93d275', // Not working

  Turquoise = '#67c6c0',

  Pink = '#ffcee0',

  IntensePink = '#ea94bb',

  // Purple = '#be88c7', // Not working

  Red = '#f16c7f',

  // Blue = '#a6ccf5', // Not working

  // Aqua = '#6cd8fa', // Not working

  // Violet = '#7b92ff', // Not working

  // Black = '#000000', // Not working
```

It feels like a bug...

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