1. In a computerized environment including a graphical user interface configured to display on a user's computerized system a plurality of user design inputs in real-time output so that the graphical user interface provides an instant, real-world appearing electronic display of the user's manual design selections, a computer program storage product having computer-executable instructions stored thereon that, when executed, cause one or more processors to perform acts comprising: displaying a first display portion of a webpage comprising a plurality of user selection options for one or more of a panel layer, a decorative image layer, a color layer, and a texture layer; wherein the plurality of user selection options are configured to be selected by a user through the first display portion of the webpage; displaying a second display portion of the webpage comprising an overlay of at least one user selection option in the first display portion with another user selection option in the first display portion; wherein the second display portion of the webpage is configured to change immediately in response to any of the user's selections in the first display portion such that the overlay substantially instantly reflects user selection options selected by the user; wherein the reflected overlay comprises a plurality of pixel sets that have been added together before display thereof.