I can not add anything to the other responders as to what might be appropriate. Their ideas are very good. I do want to provide a note, however, about what is not appropriate. The ADAAG makes it very clear that the truncated domes are to serve as HAZARD WARNINGS, and should NOT? ever be used as wayfinding devices. I have seen truncated dome detectable warnings inappropriately used as wayfinding devices in a few venues, so thought it might be worth pointing this out.
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Michael Byington, MA, COMS, LLC
Certified Orientation and Mobility Specialist Co-located with Kansas Association for the Blind and Visually Impaired
Yes, I suggested rope for the perimeters of the floor labels. We use rope to mark the edges of my roller derby track so we can feel when we go out of bounds as we aren't visually staring at the floor. I wish universal design called for manufacturers to think about the blind and visually impaired when they are designing the markings being used right now but alas all the websites are focused on making signs visual only, at least it is high contrast.