MODERATORS NOTE:  This effect may have issues with newer versions of Paint.NET. An alternative plugin, called Apply Alpha Mask, is available here: https://forums.getpaint.net/BoltBaitPluginPack         Alpha Mask -- 2.0    AlphaMask.zip     Version 2.0 adds the ability to use whatever image is on your clipboard. The supported image types at the moment is kinda sketchy, but the kicker is it works for stuff copied inside