[NEWBIE] Tomb re-skin

[JobeXL]

Hi there

I'm really new to this and 've never created a custom skin befor. But since a good friend and guildmate died a few days ago from a heartattack I thought about creating a new texture for some possible unique tomb somewhere around azeroth for me and my guildmates.

So I was hoping maybe some of you could point me in the right direction as where to start looking for textures of some tomb and how to modify them accordingly.

Thx in advance for any help!