The amazing MIUI icons designed by Dexter Ren I beleive [link]
Recreated by me in order to have some high quality 48px icons I needed for a personal project.
Attached you will find a psd file with every icon in the preview, all made with vector shapes and layer styles.
If you find these useful, feel free to fill your needs. I'd appreciate if you credit me
No commercial use. Enjoy.