Someone had left fake flowers on the edge of the indoor arena, so being the evil horse owner that I am, I used the opportunity and Vallu had to deal with them!
At first he was skeptical of whether they were horseflesh eating monster flowers or if they were edible. Once he realised they were fake and didn't harm him at all, he was fine with me waving the flowers around and touching him with them.
They did make quite a lot of noise because they were plastic, and as Vallu is pretty noise sensitive I was super pleased with how chilled out he was with them! He even let me leave the flowers between his ears. One day this horse will not be scared of anything.