Funny how what they like one day might not be enjoyed the next.
To minimize the mess I used newspapers on the floor and cleared the area around them as much as possible. And for a 5 and a just turned 2 year old they were really a lot cleaner with it than I expected.
(I was Imagining paint on the walls and floors and ceilings as well as themselves. there actually wasn't a drop anywhere but the paper they were using and newspaper on the floor.)
Definitely something I will try again during different times of the year.
Don't forget to have fun! Get down and play, learn, discover and explore with your children. They might have surprises in store for you.