Flower pots? Flower/plant arranging?

I know mother's day is kinda far away but I have an idea for my mom, she loves plants and flowers. So I want to buy her a plant, well plantS and put different kinds that match well in the pot, any suggestions of what kind of plants/flowers that wont be super expensive haha aka affordable for a 17 yr old with no job, and plants/flowers that are suitable for houston weather [hot and humid]. Thanks!