For several years here I taught Sunday school, and although I didn't think I'd be able to do it, I enjoyed it a lot after I got started. I'm not needed for a Sunday school teacher anymore, though, because for awhile we only had one class and didn't need two teachers, and then when we did add another class, another young lady was given the opportunity.
But I was given a different children's ministry - Thursday night children's club. It's called "Joyful Servants of the King." After the regular Bible study the children go out while the rest have prayer time. First, we have our own prayer time, then we look at a Bible verse that we're memorizing, explain it, and discuss it. We also play games, or do activities or crafts. I've had a great time doing it with them. Here's a couple pictures:

The children say their verses to two people, who sign for them. Here I'm signing someone's paper.

And this is a game where they make armour out of aluminum foil. They used more than I expected them to, but it worked quite well. We were studying about God's Word being like a sword, and discussed the armour of God a bit.
Here are some websites where I've gotten some good ideas for activities. If you work in a children's ministry, they might be useful.
Kid's Sunday School Place - It's not a KJV site, but they have some really good ideas that I've been able to use.
Sunday School Resources - I've used a few of their games for reviewing memory verses.
Danielle's Place - There are some crafts on this site. I haven't had a lot of time to explore this site yet, but it has quite a few ideas.