Database of final BA/MA papers?
Increasingly, individual universities are requiring students to submit digital versions of theses (particularly at masters level and above). However, as far as I know this is generally organised by each university individually, often under the auspices of the university library. I am not aware of any large centralised databases, though these might exist for particular subjects. A Google search for "student thesis database" or "student thesis &lt; institution>" seems your best bet.

Do bear in mind that different institutions may have different requirements, particularly in the amount of time students are expected to spend on their thesis project: quality may not be directly comparable!