… and what you are describing is exactly what I started doing. Mapping out some neighborhood rides in light traffic. First to a local elementary school lot to practice, then to a High School further away to practice, then some destinations around the neighborhood and have been spreading out from there.
But I like to practice in parking lots, particularly on the weekends. You can usually find an empty lot around your neighborhood on the weekends. High Schools, many churches are actually empty on Saturday. Found a closed down grocery store with a nice lot.
I picked up some of those practice cones at a local sporting goods store. You can find the BRC course layouts, such as the limited space maneuvering exercise, online. Here and elsewhere.
http://www.daytonamotorcycletraining.com/range-layout-exercises.htm
These are the cones I picked up…
http://www.amazon.com/Nike-10-Pack-Training-Cones-Red/dp/B000RNQBHQ
One of the High Schools and the Community College near my home are used for the BRC course, so they both have the painted outlines already in place.