They should generate automatically, the lily pads with flowers will spawn in with the flower tool when placed on water, but if you want you can use the path tool which does give you that stone steps, but it will also spawn lily pads. So you could spawn them in and slightly erase the path to make the stepping stone bit less visible is that's something you want to play around with You can see me kind of do this at 3:27, using the path tool next to some things to get those lily pads to spawn in. I hope this kind of helps~!
