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If you are not content with the images provided with Windows 7, click the "Get more themes online" option. You will be taken to a page on the Microsoft Windows 7 Web site where you can choose from dozens more packs of art to download. Click the download link and choose "Open" from the dialog box that appears, your chosen theme will automatically be installed and activated. Balsa wood can be a lightweight wood variety taken from trees of the name that hail from your rainforests of Central America, South America, plus some other regions. The warm and humid conditions in these areas are fantastic for the development of this plant. Balsa trees grow very rapidly - it usually takes only a decade for any tree being mature enough for cutting. However, once past the ten-year marker, an unharvested tree would harden on the exterior and rot inside, making this a useless piece.