Please create 20 simple black and white images suitable for coloring. The images should be individual and include the following themes: A smiling sun A tree with leaves A playful cat A house with a garden A floating balloon A flower with petals A fun car A cup of coffee A butterfly A fish in an aquarium A bird in a cage A mountain with clouds An open book A bicycle A cupcake with frosting A planet with rings A castle A cloud with rain A rainbow A friendly robot The images should be linear and easy to color, suitable for all ages. Thank you!