Though they add a splash of variety to otherwise dull pages, any text laid over a patterned background is generally going to be tougher to read. Unless your pattern is an absolute winner, it will likely hurt your page. Similar colors . If you make a background color the same hue and saturation as the foreground, or the same saturation and value, the colors will perceptually blend, causing strain when reading. When overlaying colors, the easiest to read pairs of colors will have two out of the three color characteristics noticeably shifted.
Readers tend to lose interest very quickly.
Extremely short pages . If you break down information too much, readers won't bother to step from page to page. Keep related ideas together as much as possible. High quality images . Your users are viewing the Web at 75dpi on a monitor which can differentiate around 20,000 shades.