In case anyone wanted some locations for some of the more useful addons. I have included a list of what I personally use, below.
Power Auras Classic:
Tips for setting up Nice Damage with elvUI:
1. Place your font, sound or texture in the correct location. This would be "ElvUI/media/fonts/" for fonts, "ElvUI/media/sounds/" for sounds, and "ElvUI/media/textures/" for textures.
2. Open ElvUI/media/sharedmedia.lua in a text editor (I prefer Notepad++) and add the following code at the bottom
_type_ is either "statusbar", "background", "border", "font" or "sound".
_name_ is the name you want to use for that particular object. It could be "My Awesome Sound" or simply the name of the font or texture.
_linktofile_ is self explanatory. If you are in doubt then look at some of the already existing lines of code in sharedmedia.lua.
3. Save the file and exit. If you had WoW open while doing this you need to close it down completely in order for the client to pick up the newly added objects.
BigWigs (Raid Boss Assistant):
LittleWigs (Dungeon Boss Assistant):