Hey there! You can use different color & hex codes in Text Values, signs and your plot's name. These alter the color of the text after them.
To use color codes, write something like
'&[color]Hello World!'.
[color] would be replaced by the color code (You can find all of the vanilla codes in the Reference Book from dev mode). Note that
'Hello World!' can be replaced by any text you'd like, and you can use multiple color codes in a single Text Value.
Using this, you can achieve a simple gradient. If you want to use colors that are not in the Reference Book, you can use
hex codes. Click
here for a detailed guide on them, but basically you would search for a hex color on Google, and then input it as such:
&x&R&R&G&G&B&B, where you replace R, G and B with the corresponding values.