They are a cascade of knitted butterflies and flowers.
Someone has done a lot of work creating these.
I suspect it is part of the jubilee celebrations over the weekend.
Simple QRP projects, 10m, 8m, 6m, 4m, FT8, 160m, WSPR, LF/MF, sub-9kHz, nanowaves and other random stuff, some not related to amateur radio.
As we were in London to see "Guys and Dolls" at the Tower Theatre with our village theatre group, I decided to take this photo of ...