Just a decorative rim that presses down over the top of a tissue box for Halloween decoration. (Can be used to dispense tissues, but frankly the web shape tends to tear them if they are roughly handled.)
Mostly just for fun anyway. The spider is a quick 5 minute print, and can be glued on, or scattered around as a separate decoration. (Print one and put it on top of the toilet - it looks very real out of the corner of your eye. He-he-heh!)
I've also included a separate (plain) rim that can be used on empty tissue boxes to turn them into quick storage for all the bits and pieces that tend to accumulate. (I use a lot of these.)
Make four diagonal cuts into the corners of the top of the tissue box, then fold down the flaps. The rim will press securely down over the folds.