I would have posted them on my own site, then shared on social networks and tagged college etc using relevant hashtags. instead of trying to get college to hire you, you'll redirect attention to your site, get likes etc from their community of followers and traffic to your site, up your brand awareness and get jobs as a result ..land then the college would hire you knowing that their followers etc already liked you work too! People and corporations are busy; Don't waste your efforts on telling them how they could use them, show their audience a few and let them to the work for you