Recently developed these queries to assist with the evaluation of development or sandbox environments. Sometimes disk space demands that old projects be cleared out, and managers/admins want to know what has and hasn't been used recently.
These queries are built around the dm_db_index_usage_stats DMV and use the last_user_scan, last_user_seek, and last_user_update dates to determine the databases and tables that have actually been used recently. This is done at the index level.