How to customize the temporary directory in Twisted Trial

I am trying to run a twisted.trial.TestCase that depends on resource folders (images, for instance) that reside alongside my Python package called test. Unfortunately, the temporary directory that gets created upon running the test runner (i.e. issuing trial test) doesn't include (naturally) a copy of the whole original working directory, and my tests fail because the images cannot be found. The function of the software is heavily dependent on those images, so they'll need to be a part of testing.

The question is, is there a way to customize the _trial_temp directory that the test runner normally creates from scratch so that it includes certain files and folders, besides what the test runner itself thinks it needs?