Flower Boxes for Front of Colonial

I have a rather staight-laced colonial that isn't very appealing from the front. I am considering adding flower boxes to all the windows to supply some color in the summer, some decorating locations for Christmas, and some texture for all seasons.
I'm fairly handy, and can install anything I buy, but I can't make boxes myself.
I have vinyl siding.
So, the questions are: What should I install? How should I mount it?
Any suggestions are greatly appreciated!

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