Found somewhere that do great buttons. Apparantley, they supply companies like Mackie etc.
If you wanna do the same look at www.rjselectronics.com
They can supply metallic buttons with symbols like the play ‘triangle’, stop ‘square’, mute ‘X’ etc that let the LED light through.
Sweeeeeeeeeeeeeeeeeeeet!!! 8)
Ok, yeah, sweet they are (“Hello Yoda!”).
But: Where can you get them? There´s no “order” button and they don´t look like guys selling 10 of those switches (more likely 1000s). :-\
And the price is a *little* open question, too.
Information you got have more? (“Bye Yoda!”). 
This may be true. I phoned the boss up and got friendly and tried to appeal to his good nature. The buttons with symbols are very expensive the the numbers I wanted £2.50 a pop!!! However, their basic ones are still way better than most others I have seen and they are 80p a pop. The best thing is to email them and ask. I will be placing an order next month to build my Maven basher!!!
Cool, keep us informed in any case! Wouldn´t have thought that! 
Perhaps I´ll email them, too! 