Logo design for a website

The website name is Dynamic Marketing Services. The logo must be simple looking and should symbolise the following definition of dynamic. Dynamic = active, changing or responding fast, characterized by continuous change, activity, or progress The business has a strong connection with number 7. So, we want the logo to have a connection with 7 ((not merely displaying the number 7). We prefer natural elements used for the images, provided the definition of dynamic is used to design Preferred colors - red, orange, yellow, blue. You can use shades of one of more of these colors.