The Bible is full of small things which God used in wonderful ways. I've made a list of some of them. It's a somewhat random list, but enough to start you thinking. You can find other small things to add to the list. Now see if you can pick out three or four related things, and make an inspiring lesson from it. I've only ever made one such lesson but I'm sure there are several effective lessons to be gleaned from this concept. Have a go yourself.
Small Things that God Made Big
A heap of dust (Gen 2:7,21-22).
One bone from Adam (Gen 2:18-24).
An old childless man (Gen 15:1-6).
David and Goliath —one small stone fells a giant (1Sm 17:41-49).
A handful of flour and an empty jar (1Kg 17:8-16).