Sometimes we're so focused on taking pictures of our family that we forget to take pictures of our home.
I never knew how important this was until I had children of my own, and after searching, I found precious few photos of the home where I grew up. Something happens when we become a parent; we start to think about our own childhood in ways we never really did before having children.
It's wonderful and nostalgic and special. Unless those photos don't exist. And then it's just plain sad.
We need to remember to make pictures of our home environment. This is important because our children are going to want to see the home where they grew up. They're going to want to see where they slept and where they played and where they ate. They'll be curious about what artwork adorned the walls of their home and what color those walls were. They're going to want to see what books they thumbed through and what toys they played with and left all over the floor. And yes, they're even going to want to see what messes they made.
(Maybe I want to document those messes in particular in the event that my daughters have children of their own and wonder, "Well, GOSH, I was never this messy as a child!" And I can say, "Au contraire, but you were, my love!")
Take pictures of your environment. They don't have to be fancy pictures, but they should exist. Even if it doesn't seem important to you now, do it. One day, they'll be so glad you did.