The puzzle background goes contrarian to the text label and makes my eyes/mind jump while trying to read the labels.
The first button makes me think of Wikipedia, the second one of Facebook. It's precisely that kind of cognitive dissonance where you read "blue" written in red and get asked to say the color or the word.
The last button has embossed text for some reason, possibly in an attempt to make it readable in face of the noisy background, but in turn it makes it stand apart from the other buttons.
The whole theme of the design reminds me precisely of the design language of Mac OS X from its origins to Leopard. It's not bad per se, but people don't need as much no-so-subtle hints as before in the UI, which get perceived as distracting noise. It's not zeitgeist anymore.