Hi Lisa9126. First, let me welcome you to QB and the UFO thread.
Do you have any idea about what you want to make with your DH's CR bags? Do you want to make a quilt? or perhaps a wall hanging?
Do you know the fiber content of the bags? I 've seen CR bags but don't remember if they are cotton or a man-made fiber. That information will help you when you decide about washing the bags or the project after it is completed.
Is the fabric woven or knit? If it's woven, you shouldn't have any difficulty using in in blocks or using it as a block. But if it is a knit fabric, it will stretch. I would suggest putting an iron-on interfacing on the back if it is knit.
If I were using these bags, I would probably wash them and then cut them apart along the seam lines. That would open them up so they could be used as a piece of fabric. I don't know if any of this has helped you but someone else will come along and add to all my suggestions, I'm sure. Good luck..... don't get overwhelmed. It's a process of little steps.