Maybe instead of that large white frame of flowers, something this size or a little larger could be an alternative? - in white- and filled with colorful flowers as part of the guest table backdrop? This would then be an alternative to the green/flower wall backdrop if that can't work
Try putting inspirational messages on clipboards and hanging them on the wall.
I found this sticker for the fire extinguisher at Amazon: https://www.amazon.com/gp/product/B00MB1ORIW/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=B00MB1ORIW&linkCode=as2&tag=thgrwaho-20&linkId=579b478850c93d5204484e70cd7bb22d More