Call To Action Wording Required

We have a great web-based application specifically tailored for the small-medium business owner and as part of the site we have created a section for "customers or shoppers". As part of our promotion we are running a unique online competition, the details of which will be disclosed to the successful encumbent, and we require someone with exceptional graphical and english skills to create a poster, which can be printed in both A3 and A4 format, for display in shop windows etc. A by-product of this work will be a stunningly simple email / fax which grabs people's attention immediately and has them reaching for the phone to get more information or even better still, has them signing up online. Please provide details of your previous work, with samples.