Betta Bilda Sorting Lego & other brands I find I've some slightly smaller bricks from primary school, asked on 1 other website with no answer as to what it =. Mixed batch included green tile that I remember. Just now saw batch of it on eBay, final got answer. Seen some in a mixed batch, but wouldn't let me bid. I'd make a toy camera at school, see through hole then push bricks across to block view.