I loved this -- from a devotional I recently listened to, given by Jeffery Thompson (a grad school colleague of mine, actually). He quoted his mission president's wife, who said this:
When I do the laundry, I am building the kingdom of God. When I scrub the floors, I am serving the Lord. When I tidy the clutter, I'm an instrument in His hands. I do a lot of mundane jobs, but if my eye is single to God and I'm trying to serve my family, then I feel [great] purpose in my work.
That's not to say, of course, that there isn't anything else of value that can be done in a day besides housework. (And I'm not saying housework is only ever the role of a woman...we should work together as partners to tackle the tasks that need to be done. But for a SAHM, it makes sense that a lot of the work should fall under my umbrella.)
But I think it's so easy to relegate the routine tasks of life to the category of 'unimportant' while envying others' tasks or jobs or responsibilities that seem more glamorous.
The glory should be God's and we should be His instruments. Truly.
I'm going to try answering my husband's question with "building God's kingdom" and see if I feel I'm really being honest. Because I think I'm going to realize that I need to tighten up my time a bit more to really be better at giving Him my heart and my time and my life.