Steps to reproduce:

1. Create a Top Items dashboard widget
2. Add hosts
3. Add items
4. Set thresholds for items.  In my instance it is monitoring a vendor's api with 4 possible values, 0, 1, 2, 3.  Setting a base color (if desired, I'm not) works as expected, but thresholds do not change the background color of the value.  I've tried this for other item types and they do not work either.

Result:

**

Expected:

I set the base color to reflect what I expect it to look like.