Portfolio site includes?

In a portfolio site, someone cud add his work in it. But does it include only original work I mean work that has all metrials created by you. As for like brushes and filters you have used for free from websites and created a print art with them. Does that allow to be added in your portfolio?

In school we work different projects and we kan use anything for free. What I mean by free is free brushes or Ideas from others and devolope it for more and better. Not copy a site. But just get ideas and resources that are presented for free to use as long as its not making money from it.

Is that allowed?