You are in the Bay watershed. The prettiest fish in this part of the country are darters and sunfish. Sunfish will live closer to you, but they will need a larger tank. Darters and some small cyprinids would be more native to the headwater streams, but if you can find out which river you live closest to, you can research the headwater streams of that river. You should be able to fit a few in a 29 gal. If I remember correctly there is a user on TFK who has a very nice native stream biotype in a 55 gal. His tank has a nice powerhead, large rock substrate and just a few bits of driftwood. I wish I could remember who has it.
You may also be interested in this site: The North American Native Fishes Association
It's dedicated to people who like to keep North America native.
ETA: I should add that I studied the native fishes of Virginia not Maryland, but they are so close that most species overlap. I actually have a degree in Fisheries Science from a major VA university and maintained a native fish tank for my professors there for about a year.