thank you for this link
I want to edit the texture of the birch door, oak door and dark oak door. I don't like the texture with this grinning face and would prefer designs with iron mountings like the other doors (granted, I don't like the green of the acacia door not so much, but it's better than the oak door for example). I would also chance the design of the wooden-blocks of birch and other more to the design of oak (I don't go for the diagonally plank design).
Well, I did redo the doors when I took over the pack. You might like them. Just redownload the main pack from the new thread. Here's an image of them:
Anyway, to edit textures you will need an image editing program capable of handling PNG files. There is of course high end software that cost money and lower end stuff that doesn't. High end software includes things like PhotoShop which is available for Windows and Mac. Lower end software is something like Gimp which is available for Windows and Linux.