Step 1: Obtain high-contrast templates

Picture of obtain high-contrast templates
The first thing I did was to check and see if anyone else had built something like this already. I didn't find anything I liked, but I found a few projects that I pulled ideas from. During my search, I found these great templates for the actual objects suspended by the mobile. The templates can be found at http://crafts.sleepingbaby.net/mobile.html You can download the templates as .pdf

Print the file, and cut out the images. Warning: this will use a lot of black ink.