You can build a reputation as an expert spreadsheet developer. This certainly doesn't hurt the resume. Using Excelville.com to sell spreadsheets allows you to set up a profile with your work, biography, and other info that certainly makes for good conversation material during interviews.
You'll need to find a way to make your spreadsheet accessible. You can build a website, which will require paying for a domain, hosting, site security, dealing with an internet transaction service, graphic design, content for the website, marketing your website, Search Engine Optimization, and all the other madness that comes with managing a site.
At present, some of the most requested types of spreadsheet packages in the market are: 'Spreadsheets for Small Businesses' and a subset of that: 'Spreadsheets for Actors'.
Elaborate, properly constructed spreadsheets greatly simplify a wide range of activities and processes within companies, enabling business owners to economize valuable time and effort, increase the efficiency of their business (Analysis), keep track of different tasks, manage their budget, optimize the planning of future events (Forecasting), organize and access valuable information, and optimize the completion of specific tasks. And thus, thanks to their many benefits, spreadsheet programs have come to be considered indispensable tools for businesses in today's competitive climate.