Lol ... I got creative this winter with Fish Oils, Anise Oils, old coffee grounds and Garlic scents. All mixed in petroleum jelly or on their own.
I made a mess in my kitchen and stunk up my house in the process. I'm finally getting around to test them out and so far I found they don't hold up well on soft plastics at all. The oils just come right off in one cast. The jelly based scents hold on longer but not long enough. Using my sense of smell the scent is gone rather quickly.
IMHO - I don't think it's worth it. There are too many good products out there which hold up much better than mine. JJ's and Megastrike come to mind.
I will keep testing but so far I am not impressed with my Fish scent making abilities.