[MAC] How to link different screenshots together?

So im looking to put together a bunch of puush screenshots i have all together into one big screenshot.

How can i do this, preferably without additional applications unless necessary, [ON MAC]

Thanks!

 

http://www.maclife.com/article/howtos/how_create_photo_collage#slide-0

 

Not looking to print it out; just to make a new screenshot that consists of all the screenshots i have.

 

you cant. you will have to get gimp or photoshop. or find like some sort of online collage type thing.

 

You don't have to. You can always gyazo, puush or printscreen the end result.

Photoshop is much easier, it's a novice task.