Kids go through phases so don't rule creativity out if you child screws their face up at the prospect of painting or drawing a picture. There are so many ways kids can get creative and it's important to let them explore them all to see what they are drawn to.
Here are a few things to explore:
Lego. They can make what is instructed on the packet or just let them come up with something completely different. Join the Lego Club, it's free. They always have little competitions for the kids to come up with a new design.
Pottery or Clay Creations. Simply using clay or play dough to create little creatures or something practical like a bowl is still creative. And most kids love to get their hands dirty with this very tactile medium.
Hairdressing. Give a doll a new look. Use clips and ribbons to style something different. If you have some old dolls around, maybe even try a haircut!
Photography. They can do this on their devices if you don't have a camera. Get them to try and take a photo of an emotion to get them to think outside the square. For example; see if they can take a happy photo. It is really interesting to see what they do take photo's of and their interpretation.
Sculpture. These can be made of all different mediums; cardboard rolls, sticks, clay or even stones. This will help introduce them to the concept of line and space.
Cooking. Let the kids loose in the kitchen! Bake some biscuits or patty cakes and get them to decorate them.
Nature Art. Go outside and see what you can find. Using sticks, leaves, rocks, anything really and see what artworks you can make using the different things.
Just remember the child will react to your presentation to such tasks. If you don't have any enthusiasm or commitment to the task they too will just think it's going to be boring. Give it a go, you may find you are actually having fun too!