Best place for creating icon for Libs and Apps?

Enonic version: 6.9.1
OS: Ubuntu

I’m going to add a lib and app in the near future. Where can I get a nice icon as seen on the market ?

I normally create them using
But there are tons of free vector images online, so just doing a quick Google search for “something something filetype:svg” and then make sure the file is free to use is also an option.