Question about coloring...

I was just wondering how to get the color effect on these icons?




I know there are different techniques used here, but I figured I might as well post them all in one post. Al of these were made by icon_ascension. (Uploaded to my PB account, but I did not make these or anything)




EDIT: I got the darkish one, but am still wondering about these two.



And to those who have helped me so far, thank you SO much!!!