Nothing -- no interaction with others, no creative act, no work even if no one else sees it.
I don't know how this works but God can even use household tasks for His glory. Do dishes and clothes for Him. Cook and clean for Him.
Paul writes in Colossians 3:23, "Whatever you do, do your work heartily, as for the Lord rather than for men,"
God will give meaning to the most mundane task. And when given to Him, the mundane no longer is mundane.
Since last November I've been sketching almost daily in a large sketchbook a friend of mine gave me. I began doing this because I desired to find my own style of drawing. I dream of being a professional illustrator. I am pursuing that dream -- no credits yet for me but I am working on it. I've sold paintings but that isn't the same.
And with my sketches I wondered what I'd do with them besides just looking at them.
That is enough in itself but I wanted more.
My sketches now have a purpose too - - I look through them and reuse them if something strikes my fancy. This weekend is an art show at the Pierre Chamber of Commerce in Pierre, South Dakota. Four of my paintings are in the show. Two paintings are patterned after my sketches.
Here's one of them:
God will do the same with anything we offer Him -- use it to create something that adds beauty to our lives.