Where should I store my application data (i.e. json, images and some audio files)?

I have a top-bar setup that requires some additional files: 1.

.json

for icons used in that bar. 2. Some custom

.png

s like google-

.png

,

.png

. 3. Some

.mp3

files like

.mp3

for incoming notifications. Now the configuration file for this bar is stored under

~/.config

and I want these additional files to be specific to the current user only too. A different user must set his bar up himself. Another thing is some of these files won't change (i.e.

-calendar.png

,

.mp3

) and some will (i.e.

.json

containing calendar events). In that case what's the best way to store these files?