I have some favorites that just don't seem to suit me. I can give them up in all good conscience -- sometimes. Sometimes I just can't, and they will pop up in my noodling sessions now and again.
Just this week I hit on the "feel" for a particular song -- a "contemporary" Christian song from the 80s you probably wouldn't remember -- that has haunted me for years. The original recording was heavily piano-oriented, and the original singer had a totally different sort of voice to mine, and I just couldn't make it work. Yet suddenly I found the right way to attack it, with slight rhythmic changes and phrasing, that allowed me to make it fit my fingerstyle guitar and voice.
A delightful thing, when it happens. :-)
-Glenn