Customize iPhone 5 background?

I was wondering how I could make a collage with some of my own pictures, but still have it fit my phone screen. I just made one, but it's too small for my phone screen & it has to zoom in if I want to set it as a wallpaper! Does anyone know of any apps that can make the collage the correct size/aspect?

There may be applications which can do it, but a dedicated graphics program would almost certainly be more versatile.

Serif do a free version of DrawPlus http://www.serif.com/freedownloads/
But there are others.

You can adjust you pictures' sizes and assemble a collage, then export the finished job as a GIF, JPEG etc.

Do one thing and the easiest of all. Take the pics that you want and make the collage in your PC or Mac and upload it to your iPhone. Make sure the resolution is more than 1136 x 640 or you can just make one at 1280 x 720 and that will fit fine on the iPhone 5.