Font Use
Keep the fonts with the formality of the website in mind. A business site should make the font as well readable and presentable as possible. A simple sans-serif type font would work well. On the other hand, a more artistic website, perhaps a fine art site, may want to use a more fanciful font in it’s work.
Website Theme
Make sure the theme of the website matches the company or organization it represents. If the website was made for a food company, it would make sense to stick to that particular category, rather than revert to a different theme.
Color Matching
Try and design the website with matching colors. If the theme of the website is darker than normal, try and keep the amount of bright colors to a minimum. Be sure to never mix two very different colors, such as yellow and purple.