Create a custom option in Magento on our template to include base and sale prices for all items

We have an ecommerce site with some messed up pricing at the moment. We want our site to show our customers that they are getting sale prices, and what percentage off they are getting. Right now, they can only see that for the main items, but not the custom options. And it only shows them the regular price and sale price. We would like it to have a little graphic showing "30% OFF" or whatever it is. We need this fixed asap! Thanks!