It is not obvious at all.
Select the cells/columns/range that you want to display this way.
Go to Format > Cells, on the Numbers tab, choose Custom from the list on the left. In the box at the top right, type in
[COLOR=blue white]+0;[red]-0[/red];[green]0[/green][/color]
Then click OK.
FYI:
[blue]How positive values display[/blue]
[red]How negative values display[/red]
[green]How zero displays[/green]
[tt]_____
[blue]-John[/blue][/tt]
[tab][red]The plural of anecdote is not data[/red]
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