How to make eye pics like this on an IPhone 4 s?

Ok so I have a iPhone 4 s I guess and I really want to make pics of my eyes in collages and make them look like a tumblr picture and I really need some good advice that's worth it like some free eye pic apps that really work so please answer as soon as possible! And pics are down below of the kind of pics I want to take

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I'm pretty sure you simply turn your phone sideways, take the picture, then crop out the excess. After that you could use a photo editing program to put them all together. Heck, you could probably use paint but it would be a bit harder.