Changing Icons [Need Assistance]

[Legitdeadeye 14]

Hello everyone =)

This question is directed to those who are really familiar with wow and the type of icons it has. In WotLK our fishing bobber icon ( The one when you mouseover the bobber and its this yellowish icon) So I was going through some of the newer expansion icons and I'm just wondering if it is possible to maybe take the new icon and using it as my own fishing bobber icon just for fishing.

If anyone have an idea on where to start then please show me in the direction i need to go. If it is in the dbc's please let me know which one so i can start playing around. 

Thank you for reading and i hope you have a great day.

L.