I was trying to think of more ideas that could be universal no matter the sex, as male cards always tend to be a struggle. This was made for yet another sister-in-law, who happens to share a birthday but not birth year with her sister. When I think of her, images of energy and celebration come to my mind, so I kept thinking of fireworks.
I ususally like to stick to people's favorite colour when I am making something for them. In this case we have many shades of green.