Recently, when Jebediah landed at Kerbin after a flyby of Minmus in my career save, I noticed that the cacti ground scatter look a bit absolutely terrible. They completely lack detail of any sort, and have no variety other than in size, not to mention the size variety isn't varied enough to see many realistically-proportioned cacti. More realistically-sized cacti combined with the monstrous ones, more detail on the cacti, and more cacti models (one or two more) would add tons of flavor to the barren desert.
See a Kerbin cactus for yourself.