It would be a bit complicated but you could do it via the coloring in the Configure --> Configure Statistics window on the Stats tab. You'd want to use a complex expression - for example:
cnt_players between 2 and 7 and ((cnt_vpip / cnt_hands) * 100) between 35 and 100
would be for between 2 and 7 players (including 2 and 7) and VPIP between 35 and 100 (including 35 and 100).
For more on how to do configuration of this type please see the
How To: Advanced HUD Configuration.