Some ideas so far

Green the Queen, idea by ARIA/Urbis
This image depicts added greenspace to Victoria Bridge to enhance the connection between Queen Street and South Bank.
Frog's Hollow Civic Space, idea by FORM
Brisbane City Super Canopy, idea by Urbis
Subterrain, idea by Andrea Goodwin, Creative Road Art Projects
Seasonal River Pool, idea by Urbis
Gabba Plaza, idea by CUSP
Green the Queen, idea by ARIA/Urbis