Hi Ben, and welcome. A few more questions - are your containers in a situation where there is full sun, some sun, or mostly shade? A picture of the area you'll have the containers would be worth a thousand words. Tell us which direction the sun comes from, too please.
How big are the containers you want to use? If you haven't bought them yet, get them as big as you can handle, and a light color is better for keeping the roots of your plants cool.
Do you have access to lots of water close by or will you be hauling watering cans? Will the containers be under cover (such as on a balcony or covered patio) or outside where the rain and sprinklers will water them?
Will you be able to move them to take advantage of the changing sun angles in different seasons?
All these things will help determine what plants you should go for. You don't necessarily need flowers all year to have nice color in your pots, either. Things like Coleus and Cordylines have colorful leaves and look beautiful all year round. Here are a couple of my Coleus brightening up the garden right now. They don't mind sun or shade either.