I found this limited-edition fashion-color Bic 4 color pen at Tesco the other day and had to grab several of them! I couldn't resist the purple, pink, turquoise blue and green colors. As soon as my kids spotted mine they each had to have their own too!
Even though I originally bought this pen purely for fun, it has turned out to revolutionize my color-coding method. Originally I used black for most things, red for very important things, blue for travel and my husband, and green for exercise.
Now I use the colors as shown in the photo: Purple for me (of course!), pink for my daughter, blue for my son and green for my husband. Now when my daughter needs to take something in particular to school, has a library book due or has a dance class, it's noted in pink. When my son has sports practice or learning activities, I write them in blue. This has really helped me visualize who needs to do what and when!
Another way I use the person-designated colors: when my son has sports (written in blue) and my husband takes him there, I circle it in green (my husband's color). When my daughter has dance (written in pink) and I take her, I circle it in purple (my color). This way I know who is taking which kid where and when. Excellent!
And on top of all of this functionality, the pen looks especially gorgeous in my Deco with my colored tabs!