Wow. Your customers are suggesting a product improvement, and you warn them about voiding their warranties. That's quite arrogant.
Why not realize that your customers aren't happy with the non-stealthiness of your product and in-good-faith offer to support them in improving the situation?
It seems to me that there are many devoted JRB customers on this site, many of which are long-term repeat-business buyers. When that group is telling you that there is a definite need for more stealthy color options, perhaps that should be taken at face value.. This is certainly not the first time that the issue has been brought up. Even if the only response to the issue is to aid them in adding tie-outs so they can easily 'flip' the quilts, that's better than nothing.
As an avid member of this online community, and as a manufacturer, you certainly must realize the value of direct product improvement suggestions from your customer base. There is no doubt that this forum, and recommendations given on it, have generated customers for JRB. Why not take the opportunity to realize that those same customers are asking you for a product improvement, and do something about it besides telling them that they're voiding their warranties by making those improvements?