Nymburk is a small city 40 minutes from Prague. Thanks to the festival Město=galerie, taking place regularly, there are many murals. Most of them are near the main railway station.
An alternative district, close to the Prague historic center, Žižkov is an interesting alternative for a street art walk.
Brno has a few pieces of street art : modern sculptures, murals by Malujeme jinak and the project Brnox.