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MusicBrainz is powered by Postgres. You can download a snapshot of their database here: https://musicbrainz.org/doc/MusicBrainz_Database

It's a few gigabytes of data, compressed.

I just found this list of sample databases -- https://wiki.postgresql.org/wiki/Sample_Databases

I'm not sure how good they are though.

Not sure if this is what you mean but PostgreSQL 9.5 introduced TABLESAMPLE. https://wiki.postgresql.org/wiki/What's_new_in_PostgreSQL_9....

Sorry, no, I'm meaning example databases with 'fake' or sample data.

Some time ago I converted Northwind to PostgreSQL for testing. I should still have that somewhere. If you'd like an SQL dump of that, drop me a line: jakob@eggerapps.at