How to get clear iPhone wallpapers?

I have a jailbroken app called wallpapers. I like it because it lets me download any picture off of google images and use it for my lockscreen and/or home screen. What I don't like is that all the pictures are fuzzy and not clear plus some of them are not the full size of the screen. What can I do to clear the pictures up and increase the size?

Www.alliphonewallpapers.com

Just type in "wallpapers for iphone" on google plenty of websites offering them will come up.

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