The current maintainer of phpLiteAdmin is not the author of these graphics.
They had been shared in our old SVN repository by Dane Iracleous.
They seem to be based on this graphic: 

https://icon-icons.com/icon/dbs-sqlite/50904
Author: pictonic.co 
License: CC Attribution 2.5 https://creativecommons.org/licenses/by/2.5/