How to increase/double size of an sqlite database file

I would like to make some tests on huge size (200+ MB) Sqlite files. I have some relatively small files (10MB) but I would like to test larger files.

Is there any fast way/tool to increase the size of these Sqlite files by duplicating the data inside their tables?

Alternatively, is there any site that can freely provide me with huge Sqlite files for download?

Thank you.