Here is a pretty card for you to print out for the kids to colour in, featuring the carnation in "nature study" style.
Carnation Colouring Card
This sunflower colouring card is designed for older children, being something like a nature study drawing. Colour, fold, and give.
The lovely big sunflower on the front of this printable card is perfect for younger children to colour in. You could even cut a photo into a circular shape and stick it into the centre of the sunflower.