What's up next for experimentation?

I've experimented with different soap recipes and additives.  Animal fats, different vegetable fats, and different liquids - coffee, beer, animal milks.  I don't think I'm a big fan of animal milk soaps at least for unfragranced.  They have a faint 'barn yardy' smell.  A kind of grass, hay, earthy smell when I use it in the shower.  Animal fats make a nice soap, but I think I'm going to try to stick to vegetable fats.  Not that I'm vegan or even vegetarian, but I don't see a super need to use animal fats.   It's always there as an option if I want to use it in the future. 

So what's up next?  I would like to try coconut milk for the liquid.  I can't imagine it would have that same 'barn yardy' smell as animal milks.  Or actually any non-animal milks (almond, rice, soy, etc) would be worth a try.  I'd like to also try pureed carrots or cucumber.  Those might be interesting additives.

I took a look at the Key Lime Pie Soaps.  The tops are continuing to turn more brown while everywhere else seems to be keeping it's color.  It's been 2 weeks.  I think it's really interesting that only the tops are turning brown like the tops have a fine dusting of cocoa powder.  Will the vanilla color stabilizer continue to work with the rest of the soap?   Hmm.... stay tuned.