The one on the right is a poinsettia, isn't she stunning. I grew her really big I just kept her moist very regular and put her in a bigger pot. Come September I will cover her for 12 hours at night and then within two weeks she will go red. Something to do with starving them of a certain chemical makes the leaves go red.
The other two are wandering dudes. They grow really fast and I have propogated them twice and given one to mother and one to sandy Pandy.
Do you have any plants? It's very interesting, I just get inpatient and want them to grow fast.