Re-Skinning

[Kharzon]

Not sure if this is the proper place as I've done very little posting here.

I have a base UI thats got a specific skin. I want to add in some things and reskin them to look the same as the rest of the UI. I've searched for tutorial, skin, skinning, etc and haven't been able to find the 'tutorial' on reskinning that I've seen people say is about.

Could anyone provide me with a link on how to reskin addon's to match the UI? Would be much appreciated.