Does this count as Crafty?

I've been living in my home for a year and a half but sometimes it feels like I just moved in yesterday.  It's a very slow process to decorate your home when your budget is zero dollars.   YesterdayI decided to rearrange the picture frames in my house to create this:

It's my first picture collage and I'm pretty happy with the results, however MANY lessons were learned.  Well, I learned that I have no idea how to find the right place to place my nails.  Sadly, there were no measuring devices used in the making of this picture collage and that is why I will need a lot of spackle before I put my house on the market ;)

Have you ever hung a picture collage?

Any tips?