As my husband Will remarked, "She'll make your bed rock."
I don't know if it's because I just had a baby myself, but I find the idea of Toph as a wife/mother hilarious (in a good "I-hope-we-get-to-see-her-domesticate way"). I can't decide if I want her potential husband to be a skinny, sensitive nerd or a huge built badass. Somewhere I read that she had an arranged marriage, but I don't remember who said that or if it has any credibility so for now I'll just wait and make suggestive comics.
EDIT: GUYS, believe it or not, I KNOW that people have babies in non-marital relationships that are not one-night-stands. But having Toph say, "hey, we're in a loving, committed relationship, let's have a baby" packs a little less comedic punch than her getting knocked up.