Design 20 different buttons

On our website, we have a big button says "Click here to show all". The open rate is about 50%, which is below our expectation. We want you design 20 different buttons, with different words, colors, fonts, graphics, or javascript visual effect. We will test the open rate to find out which one perform the best. You should have UI (User Interface) design experience. You should know what kind of design visitors are likely to click, because we don't want get 20 randomly designed buttons.