As a 7th std kid in school (2013) - I used to make and publish working themes for iPhones using photoshop and little coding
They might be pretty embarrassing design-wise now but were the ******foundations of my interest in Design
Here are some:
LS DarkBokeh - Minimal Lockscreen for iphone by LuminaryDragon on DeviantArt
Minimalietro Lite by LuminaryDragon on DeviantArt
Windows Phone Lockscreen For iPhone by LuminaryDragon on DeviantArt
Mazetro: Music Player App Theme for iPhone by LuminaryDragon on DeviantArt