These are pretty and could be made in any color
https://www.thepinjunkie.com/2015/06...uebonnets.html
Giving the kids actual canvases and acrylic paint can make for some cool art (you can get the thinner canvases at Walmart for cheap).
Some kind of trail mix thing could be fun (you put bowls out and the kids scoop a different assortment into each thing)
Paint a flower pot (tiny) and plant a small flower in it
Flower pens (cheap ball point pen, fake flower, florist tape)