Instead of throwing away your kids' leftover watercolor, use the last squirt of paint to make DIY cards. This is a great project with your kids to prepare for celebrations and invitations that need these cards. You do not have to buy the ready made ones in the store that costs so much. The good thing is you can keep them in a box and use them when needed.
Keep forgetting birthdays and recitals? Pick some Post-its and create a big calendar for the whole family. I'm sure your kids will also use it for their school works and events. There are just too many things to remember and everyone needs to be posted on the daily-do activities.