As above, Thanks.

You have some choices, one of which is to make them. A template from cardboard will take about half an hour, then you can make them out of whatever you want. The cateringv ones will likely be too short. Custom ones made by Soft Bits for 7's are another option.

IMHO GRP would be difficut to get good, but could be very nice if done well

From my own experience, you can get very acceptable results from ali sheet - see mine here or Bob's and others' here