Lighting equipment, like all photography gear, can be pretty expensive. However, with a little ingenuity, you can get soft, flattering light with the cheapest of "modifiers." This helpful video will show you how it's done.
Coming to you from Shutterstock Tutorials, this great video talks about the different options for diffusing light. Almost any genre demands this capability at one point or another, as softer light is often considered more flattering and desirable (though not always). While there's lots of specialized photography equipment for the task, any material that scatters incoming light without absorbing most of it is by definition a diffuser, and that's exactly what a frosted shower curtain liner does, besides keeping water off your bathroom floor, of course. Of course, this isn't the only way to diffuse light, but if you're looking for a cheap and effective method that provides great results, it's pretty hard to beat the cost/performance ratio of the shower curtain. As the video mentions, it's important to get some distance from the light to the curtain (or whatever material you end up using) to increase the effective size of the source and get softer, more diffused light. Try it out for yourself!