Changing list colours within a template
When creating a list manually within a template, you can select a Default colour before typing the list items if you want all items to be the same colour. To do this, select the coloured box next to 'Default colour':
If you'd like your list items to be different colours, you can select your colours using the coloured box next to the items once they are added to the list:
Changing list colours in the list library
In the list library, you can either select a default colour before creating a list, by clicking the coloured box next to 'Add item,' or select different colours next to each list item: