Depending on what you consider to be work-safe, a couple of the icons behind the cut might not be, text-wise! ;) (I really hope this works! *fingers crossed*)
My apologies if any of these icon bases belong to anyone else, to the best of my knowledge they don't, but if they DO, let me know and I'll credit you/remove the icon as you wish. They've been in my "Sean Bean" file so long I honestly can't remember where some of them came from [bad filing].
Feel free to take what you like and credit accordingly, I know they’re not as flashy as most of the icons on here, but I’m just learning!