Special Guests - children 5 and older
Make a special dinner and set an attractive table, using the good china, candles, etc. Tell the kids to get dressed up as you are going to have "special guests" for dinner. If they ask who is coming, do not give them any details. Keep it a surprise until you call them to dinner and then say, "YOU are the special guests!"

Print Jeremiah 1:5a ("Before I formed you in the womb I knew you; before you were born I sanctified you.") on a card or pretty paper and put one beside each plate. Explain that "sanctified" is not a word we use much, but it means to be set apart for something special.  

As you eat, talk about what the verse means. You might want to say something like this:  God was telling Jeremiah that He knew him and chose him for a special purpose before he was even born. He does that with each of us. He has a plan for you that even we do not fully know yet. We have set aside tonight to tell you how special we think you are and that God has a special purpose for each of you.

Close with a prayer thanking God for each child by name and pray for them to find God's special purpose.

You could also do this with each child individually on their birthday or some other time. But make sure your children are old enough to understand that though they are not the special guest this time, they will be later. You could also make this an annual event. Each year read the scripture and discuss what God has been doing in their lives this year to prepare them for God's purpose.

Created for a Purpose - young children
Tell your children you are going to play a game. Gather several items while you're in the kitchen and play "What's this for?" (Any items will work -- a spoon, whisk, pencil, pan, hammer, can opener, etc.)  Cover them with a kitchen towel and hold them up one at a time. After showing each item, ask, "What's this for?"

Explain to the children that each thing has its own purpose -- what it is used for. Someone made each item for a purpose. This is just like God who made each of us for a special purpose -- to love and serve Him. Talk about the special tools God gave them and how they might use them to serve God.