My DS shuffles between Ashley's Recipe, Ashley's Magic, Diagonal Stripes: Pink & White, Stripes: Red & White, Pokemon Friends, and the basic red, pink, and black themes
Mine's the Retro City Rampage one that was obtainable from the Nintendo Humble Bundle #2, You had to donate 20$ for 15 (I believe) Indy games, and that was one of the included titles, with the Theme.
On the bottom it has a bunch of 80's NES-Era type Purple Stripes
I just got the Fire Emblem Fates: Two Kingdoms theme a couple days ago. I'm absolutely addicted to this series now, glad I've discovered something new to enjoy.
I got the Gold Majora's Mask theme and the Skyward Sword theme, but I'm using the Gold Majora's Mask theme atm cause I love Song of Healing (it's a bit short, but hey ho) and Ballad of The Goddess is amazing too. I basically bought them 'cause of the music lol.