The exhibition had already attracted some debate, she said.
"A lot of people are discovering by mistake that it's here, but quite a lot of people stand here having a chat."
The working group behind the scheme was hoping for community participation at all stages, she said.
"It's not about council making all the decisions or people thinking it's council's responsibility to do it ... this will only work if the community gets behind it."
Ideas received so far ranged from daffodil-laden designs, to scenic landscapes or changeable murals.
Some people chose to draw or use computer graphics while others had written in with plans.
It was important people took time to consider all the designs, not just the colourful ones, Ms Gittings said. "It's not a drawing competition."
Voting closes on May 10.