They're actually quite different http://i.imgur.com/LxoNXK2.png

Any two colors start to look very different when you put huge blocks of them next to each other. It's called Color Relativity. (That's half of why Josef Albers's illusions work in the first place...)

Regardless, it's clearly _very_ inspired.

The face icon: http://dribbble.com/shots/884574-Designer-News-Badges?list=u... http://dribbble.com/shots/800428-LayerVault-icon-set-for-del...

The gears icon: http://dribbble.com/shots/800428-LayerVault-icon-set-for-del...

The newspaper icon: http://antoniopratas.com/blog/wp-content/uploads/2013/01/des...

The clock icon: http://antoniopratas.com/blog/wp-content/uploads/2013/01/des...

Don't really know what's going on with the icon collection... they are all in slightly different styles and don't fit together at all.