To change your style of dock you need to use a different theme. Options/themes then select a different one. You cant just download different icons you have to get a whole new theme. You can make the theme yourself or you can get one that is already made. You can get some themes here http://forums.crackberry.com/f126/
i know. i'm trying to make the theme. i would like different icons, though. i like the ones the bold or the 8350i have. where do i find icons for the theme maker?