Here's a colouring page of a flower in a flower pot. I think these would look lovely cut out and stuck along the bottom of a window to look like a window box display.
Here is a beautiful field of wild poppies to colour in! Grab your reds and greens and blues and have a go at this lovely colouring page, perhaps for Remembrance Day, or just for the beauty of the wild flowers.
Sometimes the background of a colouring project can be the intimidating part - which is how we came up with the idea of our colour pop colouring pages!