I am a lover of prompt writing. Here is my list of some of my favorite prompt sites. There are many more out there. Every time I see a prompt writing or photo prompt I always check it out. I have found many great sites that way and this is just a very small listing of them.
Pick a site or pick all of them and join in the fun. Always wanted to try your hand at writing and had no ideas come to mind? These sites will get you started.