We are now at this stage... none look what I'd class as 'nice'! I may just end up going with slim white plastic switch's, which would hopefully look unobtrusive with the white walls. These did look interesting though...
Those look really tricky to get right. As I understand it you have to cut a piece of wallpaper to exactly match the pattern behind, and then stick it onto the switch, in between the perspex front and the switchy-gubbins. I imagine there'd be lots of swearing and several attempts trying to get the pattern to line up exactly. I've never seen them installed, only in the catalogues, but also wonder whether you'd eventually get dirt down between the paper and the perspex. Somehow can't imagine them looking that good in ten years' time, but I don't know for sure.
(Edit) - I'm wrong, now I've read the blurb on your link, it seems you fix the switch to the wall, paper over it, and fit the cover on. What happens if there's a fault on your lighting circuit and you have to open them up?!