You can outsource design work to students and foreign workers for approximately US$2 per hour. Indeed, you're spoiled for forum that will bid for you work ( http://freelanceswitch.com/finding/the-monster-list-of-freel... , http://dir.yahoo.com/Business_and_Economy/Employment_and_Wor... ).

However, if the functionality of your app will be greatly expanded then it may also require changes to your CSS. Alternatively, you can skip a large amount of design. People don't access your website to see its innovative style. They access your website to get useful information.