Oh that's cool to hear. There's not much info out there about this plant, or pics, I just love tiny plants. It's a slow thing getting such a tiny plant to reach enough mass to even be noticed... if you're anxious about it.
Sounds like it's dropping seeds around your lawn? How tall can it get? How soft and pretty would a lawn of this stuff be?! Probably not up to the task of being walked on too often though. When I find seeds, I scatter them around the pot I'm trying to fill. Don't know that I've seen any sprouts yet, but only playing with this for the past year, starting with 3 little sprigs about 1 1/2 inches long. Probably growing a lot more quickly than I give credit for, it's probably in 10 different pots now.
The yellow one in your pics above looks like a good candidate for a hanging basket. Are you into those?
These tiny plants (Senecio citriformis) look almost ready to make some kind of tiny flowers.