When the inspiration comes...start it and you will finish it in a timely manner. It's the ideas to run with...UFOs either get moved on to others or "getter done" attitude takes over.
I took a class where the instructor said ,"If the project taught you something at that time...that's all you need ...just give it to someone else to finish and know you learned from that project. " I went home and gave away 5 UFO 's.