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This post is part of Mashable’s Spark of Genius series, which highlights a unique feature of startups. If you would like to have your startup considered for inclusion, please see the details here. The series is made possible by Microsoft BizSpark.

Name: Invoice Bubble

Quick Pitch: Invoice Bubble is a simple and affordable online invoicing solution for freelancers and small businesses.

Genius Idea: Invoice Bubble is a tool for creating invoices or estimates, while still offering features like recurring invoices and PDF downloads.

The app is the little brother of the project management tool Project Bubble. Both products offer similar features to other online offerings, but the focus is on small businesses and freelancers, which means that it’s all about being easy to use and being affordable.

Invoice Bubble is really easy to set-up — I was able to create a recurring invoice in just a few minutes. You can also customize the branding of your invoice and choose to either make it viewable online or keep it private.

I really like that you can download PDFs of your invoices in addition to sending e-mails, because some employers or companies have policies that dictate the need for PDF invoices. In the future, the option to send out invoices through the postal services will be available as well.

While Invoice Bubble isn’t as robust a solution as FreshBooks or Billing Manager, it’s extremely simple to set-up and use.

The free plan lets you send unlimited invoices to 5 clients. For $5 a month, you can sent invoices and estimates to an unlimited number of clients and get data import and export support. For freelancers or small business users who either need to create an occasional invoice or want a solution that is affordable, Invoice Bubble is worth checking out.

How do you create invoices for your work? Let us know!

Sponsored by Microsoft BizSpark

BizSpark is a startup program that gives you three-year access to the latest Microsoft development tools, as well as connecting you to a nationwide network of investors and incubators. There are no upfront costs, so if your business is privately owned, less than three years old, and generates less than U.S.$1 million in annual revenue, you can sign up today.

Entrepreneurs can take advantage of the Azure Services platform for their website hosting and storage needs. Microsoft recently announced the “new CloudApp()” contest – use the Azure Services Platform for hosting your .NET or PHP app, and you could be the lucky winner of a USD 5000* (please see website for official rules and guidelines).”

Reviews: PHP, Project Bubble

Tags: billing manager, freshbooks, invoice bubble, invoicing software