29 Nov, 2014
Background
Boolean values on a blue background
Textural background of a black brick wall
Blurred shades of gray square cells
Background with shades of gray dots
24 Nov, 2014
Background with small blocks of reddish-brown tint
Background with small blocks of brown shade
Rough dark surface
Diagonal wavy red color stripes
20 Nov, 2014
Metal hexagons (honeycomb)