These are two beautiful unknown weeds, at least to me. I would definitely keep them because I feel they have potential to be ornamental plants.
Sadly, the first one growing among the Star Grass (Scientific Name: Dichromena colorata) was already removed.
As for the second one which looks like a Torenia to me, I managed to harvest some of them for planting in waterlogged areas and they are doing well. I hope to see a nice carpet in time to come.