I found some really nice paint 'pens' with big fat tips on them that the children really enjoy using. They come in a variety of colours and the effects range depending on the way that the children use them. Some do really lovely delicate little dots of coloured paint on their canvas, others (see above) prefer to hit a little harder for that splatter effect! Either way, they kept the children's interest for ages. They also gave me a lovely opportunity to talk about colours as the children made their choices. You can buy some for yourself on Amazon. They're called 'Scola Chubbi'.