If I got bored with that, out would come the paper dolls and kid-proof scissors, I'd be happy for hours. However, the times are changing and art is now coming in more forms than ever. Children these days have access to wonderful art software. There are some options that you just can't do on regular paper. Quick paint fill, sound, animation and much more are usually standard features in most painting and drawing programs.
Children can easily print out their creations for display upon the refrigerator.
For the more advanced artist, programs like PaintShop Pro or Adobe Photoshop are available. They can easily create and edit their own graphics, which is extremely useful for children that have their own webpage. Speaking of WebPages, this is another way for kids to express their creativity. It's not as hard as you'd think, I've seen some wonderfully created WebPages by 10 to 13 year olds. There are many programs to help children create HTML and show them how to put the information up on the web.