Last year I featured some cool Lego iPhone wallpapers from visual designer Louie Mantia. His latest release called "Blue Bricks" is one of two fresh Lego images created for iPhone and iPad users.
Louie's latest Lego Brick designs include both Blue and Grey Bricks wallpaper easily downloadable for your desktop and formatted for iPhone 5, 5C and iPad. I use the blue one on my lock screen.
Be sure to also check out his Super Mario Bros. wallpapers along with several other Lego Brick colors he's captured. Did I mention that all of these are free?