Make your own shapes according to what you need.
By default or upon fresh installation of Office 2010, custom shapes is not on your ribbon. You need to go to the File (Backstage view), select the options tab. then select Customize Ribbon.
if you already have customized your ribbon and added Shape Combine, Shape Subtract, Shape Union, Shape Intersect as shown below, we can start making our own shape.
A sample illustration is shown below using the feature
you can even make your own logo
Here are some objects I’ve made from my entry:
One of the good thing with making your own shapes, it makes your file small. around 40 kb. per object, depending on how many shapes you’ve included.