Here's what a single-letter/number grid marker looks like on 16x16 resolution, zoomed in to 800% (the zoom I use to detail such small sprites)
[hider=Single800%][img=http://i58.servimg.com/u/f58/18/68/00/63/captur11.png][/hider]

Here's that same A at the normal zoom level.
[hider=Single100%][img=http://i58.servimg.com/u/f58/18/68/00/63/captur12.png][/hider]

Here's what a souble letter/number grid marker looks like at 800%
[hider=Double800%][img=http://i58.servimg.com/u/f58/18/68/00/63/captur13.png][/hider]

And at normal zoom level
[hider=Double100%][img=http://i58.servimg.com/u/f58/18/68/00/63/captur14.png][/hider]

They need to be originally made at this resolution so that they can be used on the tile program without problems. Making them afterwards and putting them next to the stretched image-host pictures would be a "rinse and repeat" that I don't want to add to the already complicated routine. Making them like this allows the tile maker to see them as a natural part of the map, and will line them up perfectly against the maps as well. So if you're ok with how this looks, I'll implement it into the games, and I'll try to make it look better over time, like trying to get the FE7 font on them and such.