What did you end up doing? I made elastic top ‘skirts’ for my kombucha jars, from cut up tea-towels. Then I made jar covers from one tea towel, so everything matched. The spigot on the jar pokes out of the split in the skirt, but it’s easy to then part the curtain, and check your scoby and brew – tucking the ends back behind the spigot, and ‘voila!’, no unattractive kombucha to be seen.