Return to your flower vase picture.
Refer to your original inspiration and add more spots of colour to add shading and light. This does not need to create an accurate representation – just ‘go with the flow’. Colour the whole page in this way – including the background.
You may not consider the finished result an excellent piece of art – but it will serve as a reminder for yet another way to begin a design exercise. You may decide to return to it after this series of prompts is over to add more colour or use part as a major design source.