I do collect seeds. We have to be careful about collecting actual plants because many are protected and/or on Federal land.
I haven't researched which ones to include into my "lawn", but will spend time on that project this winter. Right now we are going through another heat wave, so that's got my full attention in the garden.
Some wildlife is quite welcome, but right now my best friend has been dealing with a 400lb bear that has decided he wants to live on her property. She does not have many positive things to say about the experience.
Smiles,
Lyn