Prof. Dave wrote:
Toilet Paper??? Using my camera's pop-up, built-in flash I have found a $15 flash diffusor that works wonders for creating soft room light. Its called the SLIDE-ON diffusor and believe me it's magic. I actually got mine free from portrait-world.com by buying something else, but you could ask them. Good luck with your project.
50mm or 85mm should do the job.