Redesign of Set of Three Icons for Engineering Software Website

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This customer received 49 icon designs from 16 designers. They chose this icon design from wall-jamboree as the winning design.
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Icon Design Brief
We need to create three icons for our upcoming website redesign.
We have three directional icons on the website comp uploaded for reference. These current icons do not look cohesive enough for our new website. Our final icons needs to look united and convey "easy to use" / simplicity, but still have inherent sophistication .
We are open to the use of gradients (similar to our main logo - Softree... also attached), but the colour needs to remain two-toned greens in the same colours as our main company logo.
Target Market(s)
Civil Engineers - looking for easy to use software solutions
Industry/Entity Type
Engineering
Colors
Colors selected by the customer to be used in the logo design:
Look and feel
Each slider illustrates characteristics of the customer's brand and the style your logo design should communicate.
Elegant
Bold
Playful
Serious
Traditional
Modern
Personable
Professional
Feminine
Masculine
Colorful
Conservative
Economical
Upmarket
Requirements
Must have
- Set of three icons (similar to the content of the provided example)
- Each icon must be two-colour (two shades of green from our main logo)
- Each icon must occupy a similar area and look "in family" with the other icons
- Icon 1: idea: mountains / terrain...
- Icon 2: stylized road / corridor
- Icon 3: gears or another concept suggesting optimization
Nice to have
- Open to the use of gradients (similar to our main logo)
Should not have
- Strong outlining
- No words or fonts