Creating a tileset

I am also struggling with an angle to approach a tileset from. It seems that one unit in unity is 12.5 pixels. Am I correct on that? That makes a game using pixel art not feel quite right. I would love some advice on how to make a terrain tileset with unity so I can build levels quickly and efficiently (Without purchasing tools from asset store).

EDIT: Found solution: vertex snapping. Hold v and drag things together!