Hmmm...well, since attachments probably won't stick to the pad too well (given they'll be torn off or in half by feet in minutes), how about drawing on the pad with a Silver Sharpie? Just trace where each panel ends. If that doesn't work, perhaps White-Out or Puffy Paint. I bet plumber's tape will work too...
Of course, you could always go the other direction and get accessories to match...
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