I guess I'm not really sure which ones you're talking about then. If it's the messy haired boys I love them. Maybe I'm weird, but I think they're so cute.

To get more purple haired girl follow these instructions. These only apply to normal VF genetics. Any two peeps can randomly produce a mutation (Like to black haired peeps having a blonde baby).

Any of these six heads can naturally produce the purple haired girl. In fact I have the blonde girl at the top, and she had a purple haired baby. If you pair the two heads in the middle the chances of making more of them is pretty much garanteed.

To get the blue haired babies you have to pair any of the six heads in this screenshot. The four bottom ones are the only ones that can produce a rainbow haired baby.