I've been a stay at home mom for three years and I can tell you that as a new mom I had a tendency to take on way too much, because before I could handle it but once the baby was there he took all my attention and time. Since I was staying at home I thought I could do everything and keep up with it, but the baby pretty much consumed me. He took every ounce of energy, focus, patience, second that I had. Sometimes you're lucky to get a shower.
Take care of your baby and yourself at least until you are both sleeping through the night. And until then don't worry about work.
Based on the design and style, there are plenty of interesting subjects from which to choose. For instance, the most popular baby shower themes are generally jungle animals, cruising boats, toy dolls, and so forth.