The lumps are vaulted skulls - many show birds have vaulted skulls, although NOT having them is NOT a fault (so far as I know, anyway). Just be extra careful with those heads as the skulls might never close over and theywill have a soft spot (kind of like human babies). Not really good at colors, but do know that the silkie color does not change significantly between baby and adult feathers...probably splash developing is the biggest change you will get.
I have some pictures of my chicks!
the one very right with the yellow fur, it's the one with the lump on its head
also wondering if anyone would know what colours they will be??