can I get more calendar colors?

Hi. I am a working mom with several groups that I keep calendars for at work. I also do separate cals for my kiddos and hubby. I like to print one cal for the family to see that includes all of my work commitments so they can see where I'll be available or not. The problem is that I've run out of calendar colors and I need to find out how to get more. We are supper-visually oriented here and that is so helpful! Any ideas out there?