I think it would be cool if there were some sort of icons for rank zones. There could be an icon for every digit, starting from 8-digit to 1-digit. The icon would upgrade everytime when ascending in rank to a lower digit.
this is *sort of* done already with the colour change of the rank between ranks 10 and 1, and the medals for achieving certain rank thresholds 50K, 10K, 5K, 1K. This does seem like a good idea tho, could imagine it working well with the spotlights badges.