Ask Wojian etc how to prepare

I-485 package if a couple file it at the same time.

Is anyone filed I-485 by him/herself?
1. How to organize two person's materials? Should I put all of them in one envelop and sent them together to INS? If yes, in this big envelope, can I just have one folder for me and another for my hu*****and? What about some shared documents such as 1040?

2. Do I need to print G-325A, biographic information,form in different color paper?

Many thanks.