The colours you chose for your website can make a huge difference to how it is portrayed and whether people enjoy using the site. Bold colours can make your site stand out but can sometimes also be too harsh on the eyes and make people want to leave the site. Sites that are developed with a lot of white can look clean and fresh but can also appear a little boring so it is all about getting the balance right.
A lot of design is down to personal preference, but remember who you are designing your site for. If it is going to be aimed at older people then you may want the text to be very clear and the site easy to navigate round, if it is aimed more at teenagers then you may use vibrant colours and videos / special effects. Why not carry out a bit of marketing research to see what the public would want to see on a website.