Board Thread:Administrative Requests/@comment-27144409-20170205193414/@comment-24573226-20170916200015

Well, you need to make pictures that are square: same number x same number in size. So, basically, find a good screenshot and crop it with whatever image-editing program you've got.

Upload that picture to the wiki.

Once it's uploaded you can edit the Mug template by putting the picture name and extension after the word image = (i.e. image = TrainSquareCrop.png)