These things are made out of the larger Pringle crisp tubes, with cigarette butt plastic ashtray cup things that look like turrets. I got from Poundland!
Just stick them in the tube cover with labels and double sided sticky adhesive bond things cut to size for masonry then paint!
I have yet to PVA and sprinkle these. One with loads of masonry and one with just a bit!
I'll use these alongside my Zvedza castle bits.