Justin, You are right about the TIA standards' status as well as EIA, IEEE and any other performance-based standard to that matter. You are not required by law to comply, and you will not be liable if you do not comply. However, the importance of the standards is in that they create a common ground, per say, so equipment manufacturers know what to expect from the infrastructure and vise versa. Also, from a manufacturer's stand point standard compliance makes a great selling point. Therefore it would not be to anyone's interest to mix things up and make a cable that's not following industry trends as long as the trend is known and, better yet, standardized.
This is not to say that you cannot order a large amount of cable from any manufacturer in practically any color imaginable. As long as your order makes the factory busy for a while, they will be extremely flexible about your needs.