Take a look around your office wether you are just starting this process or this is the last piece to finish off your home office. What is missing? I will tell you a big piece of art work! This will say the most about you personality. You can choose something modern and contemporary or a traditional art piece. Here are some options that you may not have thought about for your home office decor.

City scape
Beach
Just color
Black and white photo
Just your logo
Nature

You can always buy a piece art in a 3 pieces. Or you can have a photo printed in 3 sections. Have you thought about a  Always keep it simple and remember less is more.