Keith G wrote:

But he's got a good point - you could paint them any colour you
liked! (Do give 'em a couple of coats though - flash photos I have
taken reveal little pinholes in the paint on my 'Acoustiliths'**
because I got all of a fever and rushed then into place after only
one quick coat! :-)

I used black a) without thinking (no imagination) and b) because I've
got a lifetime's supply of black vinyl emulsion paint (2.5 lt) from
when I done me lintels.....

**OK, sodding paving slabs, then....

Nononono... 'Acoustiliths' is the perfect name. You could make a few quid
selling those! ;-)

2 paving slabs, couple o'coats of paint, put em in a fancy box... "£200 the
pair, sir... guranteed to improve the sound quality of any speakers sir..."