Sometimes simple is best. I created this gradient wallpaper pack to make your phone a happy place. 
 
This pack includes 3 yellow gradient wallpapers as .jpg files. The dimensions are 1290 × 2796. Enjoy! 
 
If you want the complete set of 50 gradient wall papers, click below:
 
https://www.huddlstudio.com/product-page/iphone-gradient-wallpaper-50-pack-bundle