I was given this challenge by my wife today: make a high-contrast mobile for our new son using only things we have in the house. Here's how to make a baby mobile on the cheap from items you have around the house. All you need is an internet connection, some extra wire hangers, some duct tape, cardboard, glue and some string. Its very easy to make, and much cheaper than buying one from a store.
Step 1: 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.