I too had a problem with marking my scriptures. I was so careful with them that even though they were several years old they looked brand new. Then I accepted a calling where I had to go to several Wards. Something I notice in my travels. I observe several people who treated their scriptures like old friends. These people would pull out their scriptures without an invitation. You would see something on their face when they wanted to write something down. I have seen them do this with laughter, sadness, and wonderment. Some I saw just marked what ever scripture that was being quoted. Some just had a special look that I would see from time to time. They would often give their scriptures an extra squeeze or a gentle pat. I asked myself what would my children see when I was gone. Would they see that my scriptures were "old friends" or would they see scriptures that look only slightly worn? Would they see my concerns, my needs, my love of the scriptures? The first time I marked my scriptures I had tears that dropped on the pages. When I looked down I thought," Some day one of my children will find these tears and wonder why I cryed."
OK, you can see what kind of member I am going to be. A story with every reply. I will try not to do that. I just could not say I color coded my scriptures! lol When I have more then one subject using that scripture I put a straight line by the scripture in the other color. I have a list of colors and how I coded in the front of my scriptures.