Sugar paper is thicker than crepe paper or tissue paper - it's the stuff we all made crafts with at school, it comes in a range of colours. I think they call it construction paper too (?)... if you made a hollow cone from it, it wouldn't be too heavy.
PVA should be ok to glue polystyrene, although it might not adhere to it as well as to paper... it tends to do better on something that's a bit absorbent. I wonder would pritt stick do the job?
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