Thanks, Tami and Smaritza (and Happy Birthday !)
I found one more thing about marigolds. They repel aphids, aphids could destroy fig tree leaves if they are in large numbers.
I ordered some strawberry seeds, will try them in the fig pots as well. The nutrient competition shouldn't be a worry. The figs are fertilized and watered often, it is going to be enough for everybody. And the flowers will add some colors too!