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A slight variation in colors to add depth. I really liked the second to last one. The way the text stacks atop itself reminds me of a building with solidifies the companies purpose.
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Nick Pulido commented:Depending on the company culture I would say stick with it. You could try a lightly serifed font - but if they want a neo-eco, or slightly green feel to it I would stay away from serifs. DIN is a safe choice.
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Thank you Nick, much appreciated. I'll give your suggestion a go. Do you have any thoughts on the font? It's fairly classic and I hope won't date, but somehow I find it a bit uninspiring.