This is a piece by Polly Apfelbaum, she has created a colourful floor sculptor.
You can use her work as inspiration for your own floor collage. Ask the children to plan it out first on paper, then maybe either in the class room or in the school hall lay out the collage on the floor using tin foil, wall paper and materials including beads, plastic bags crayons etc . The pupils will learn about colour and they can also work in teams to complete the task. Photos will be needed to be taken as it will be temporary.
Here is an oil painting by Yuko Nasu.
You need a canvas or cardboard and paint (preferably acrylic). Squeeze a splodge of colour in different places on the canvas, do this with all three colours. Drag the paint brush through them (a bit like joining the dots) but the trick is to be drawing a face at the same time. The brush will create swirls and patterns of the colours mixed together. The children will enjoy the lack of control and having to be flexible with the paint. It is a really good way of learning how to use paint and be confident with it.