Thank you very much for this. It's amazing. I've taken a look but have found a problem. Because I have 3 different sized bricks, the current setup in the file is done with s puts one size at the bottom, one in the middle and one at the top. I need the sizes to be random throughout with just the colour changing. I see your picture has some varience id width but is this random, or with 3 set sizes?
I'll try and fix this myself, I think I need to copy the three brick sizes three times, plug each set of three in to a randomize, then go in to the selector...........I'm sure you know how to do it, but I'd rather figure it out. I'll get back to you if I can't do it.
thanks for the great start though, always appreciated.