Tealight houses make a fantastic day workshop! They are suitable for ages 10+, although younger children are welcome to participate with a grown up to help them. That said, you don't need any experience and the workshop can be tailored to create anything your imagination can come up with.
I provide a basic template for you to work with, but you are encouraged to adapt it to your own ideas. You can see in the images above there have been some amazing and imaginative pieces made by people on the workshop.
* A day workshop is usually 10am-4pm