We have 2 mahoosive Vango ones which we have had for years. Together they could probably just about go right around our 5 metre bell tent. We used it for very windy sites, kitchen, washing areas etc.
They dont really suit a bell tent though, most modern nylon/aluminium camping gear does not, we also have an old school traditional striped beach type. I know you say you don't want that, but personally I think the more old fashioned style look suits bell tents better. Each to their own.
I have seen a windbreak that looks like a dry stone wall and I am so sorry I didn't buy it but I can't remember where but it would look great with a bell tent.
I remember seeing a wind break made by the same company who made my tent in the same material and colours so may be worth checking out their website or eBay for one I think they were around £15-20 about 3 years ago.
I have the drystone wall one with my Belltent, but did't pay the Belltent.co.uk price for it. Bought it off ebay for about £35. Ebay has loads of choice, vintage and new.