craftgrrl | Dyeing and replacing a zipper

I have a brown college sweatshirt with embroidered/sewn on pink lettering, and shoes with a leather applique (see pictures)

except mine is brown and pink

I want to dye or colour over the pink lettering/logo on both, but I am not sure how to approach it. I thought maybe permanent marker for the shoes, but wasn't sure that it would work for the sweater. Are there ways to spot-dye a garment? And would permanent marker stay on leather?

I also have a zip-up sweater with a broken zipper. I'm not much of a sewer, but was wondering if there are simple/fun/unique ways to (easily) replace a zipper? Buttons? Ribbon? Or should I just take it to a tailor and have the zipper taken out and replaced with a new one?

Thanks so much!

(cross posted)