In my personal opinion, i'm not a huge fan of your paths but if you like them that's all that matters.

If you play your game seasonally they may conflict with the change of seasons too because of the green edges so you'd have to change them up often, but if you don't mind that then that's another reason to keep them I guess. However, I agree with what you said they do look a little unnatural imo. I believe I have a link somewhere to some paths which are more natural however they're seasonal so you'll have to change them often.
http://floatingpresents.tumblr.com/tagged/rae's ac resources
these are stepping stone paths for dirt patches, but i'm sure if you look through the tumblr a little bit you'll find the ones for autumn and so on.
Good luck!