I make cold process soaps using Goat milk yogurt for sale locally. I have never used figs, but I have tried many different dried plant herbs and plant material, I would use only dried figs personally.
I'm totally unsure how this would effect shelf life. I have actually had some soaps with oatmeal on top mold, so I stopped even though it looked cool on top.
I thought dried rosemary would be a cool additive for a soap, extra exfoliation and such, it was a flop, it turned black and my wife's words were "it looks gross." Same with poppy seeds, looked a little like tiny bugs. Ground ingredients seem to work better. I second what cyberfarmer said, if it's the scent your after, infuse in whatever base oils you use or the oils you superfat with.
If it's the essence your after I suggest dried and ground up in a powder and added like oatmeal. Interesting, though I doubt I would ever have so many to try it. Let us know how it works for you.