Hmm...there are a lot of good answers
I feel like the bridal/wedding alts would go hard chunky. Stretching dresses to the limit, popping buttons on shirts...lots of good stuff.
The ninja banner would be pretty funny if everyone was fat as fuck. Just in an ironic sense mainly, but also fat ninjas are fun.
Winter alts too, gotta bulk up for the season or w/e.
And bring back the dancing banner from launch year! I need belly dancers!