Got a large piece of paper out this morning and scratched my head! Let's texture I decided. Helped by the fact that O has 'Thready Bears' which he loves! We started doing rubbings of the 'Thready Bears', then realised the tiles have texure too... the hunt was on - what else could we find to texture: a plastic play knife, a steamer O plays with, and a funky floor mat!
Tip: broad surfaced crayons were the best for texturing.