How to use dynamic queries for generating reports?

For e.g. allowing a user to select the table(s) / column(s) he wants before generating the report based on those field(s) selected.
or is there any way to invoke Query Builder directly while running a form?

You can get the tables and columns from the sys-views user_tables and user_tab_columns. Use them to populate your LOV's, construct a sql-statement and execute it using dynamic sql. ("execute immediate" or the dbms_sql-package)

Commit;
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But i want to know how you set up the field properties like Name, color...... if the content is trully dynamic? You still have had some pre-define reports ("templates") to be used, right?

Thanks