Modelling 'LitraCon' Light-transmitting Concrete

I have a student who is currently designing a museum for his
dissertation. Can anyone offer advice in modelling this
Light-transmitting Concrete
(http://www.litracon.hu/building-blocks.php)?

For those who have never heard of this material before, it is basically
concrete with embedded optical fibres.
Initial thoughts are to model as 'trans' material modified with a dirty
function for the opaque areas, though there is a definite suggestion
that the optic fibres be arranged in rows or columns within the block.

Regards

Terry Mc Minn
Faculty of Built Environment, Art and Design
Curtin University of Technology
GPO Box U 1987 Perth 6845 Western Australia
Email: [email protected]
CRICOS Provider Code: 00301J