Since there are multiple ideas suggested here, I will voice my opinion on each individually.
These are mostly simple changes usefull for town mayors but here they are:
•For sale plots:
For sale plots are highlighted red in towny map (like forsale shop plots are blue) to make them stand out.
~ @twomoo1119
I'm not sure how you can't pick out the difference between $ and + for 1.
~ @xQuartz
This is a fine idea, as it distinguishes between shop and resident plots. Perhaps another color for Embassy plots would be nice, as well?
•/towny map huge
This would be a 4 by 4 display of /towny map big in a much smaller font usefull for extremely large towns that go beyond /towny map big.
~ @twomoo1119
Again, a very good idea. This would allow people to also search for any towns remotely close to a possible location for their own town, in addition to a benefit for mayors with very large towns (as far as land).