The diploma thesis is based on the web Prestastyle.com that was founded in the first half of 2010. Initially it was a non-commercial project where users could find one free Prestashop theme that was ready for download and might be applied for eshop. (Prestashop is open-source solution for eshops) Due to personal reasons I stopped to build the project after short time. By this work I want to continue in the original intention. However, there should be more than just free themes. I want to offer also paid themes and modules of high quality so the users get valuable products. I describe the complete process of reconstruction of Prestastyle project -- setting the goals, analyzing of requirements, defining of users. As well, I present my business plan, which includes also a description of competitive sites and shows my advantages. Then I get to the technical solution and the realisation. There are variety of insights to problems I encoutered during the development. At the end I describe testing of the project and themes, I analyze results and compare them with the set objectives. I evaluate the final results and benefits of the work.