I lost my lens cap
Today I had the Polaroid 230 and my Holga out while I worked on my very lame photography pseudo-project (pseudo because I'm not trying very hard), which is a series of photos of Solo, my Border Collie, sitting on abandoned furniture. Anyway, I digress. I lost my Holga lens cap. What can I use as a replacement?
Yes, I realize the lens is plastic and not coated and that if it gets damaged, frankly, the photos will probably be more interesting but I'm sort of anal this way, so humor me?