Hi guys, this is my first time posting here so I'm probably going to end up doing more than one thing wrong. Feel free to e-smack me.
I looked around but I couldn't find this anywhere but, I want to know what kind of effects/coloring we're used to make these icons:

Both made by __iiicons. They look really simple but I can't figure out what was done to them exactly?
Could anyone help me out please?

Thanks in advance ♥