stonefeather - 5/10, stone- is fine but -feather I'm not a fan of. what could it represent? cats don't have feathers. birds do. are we saying this cat is a bird? if they're very agile, try -tail, if they're very quick, try -foot.
bluemist - 5/10, blue- is a good prefix but again I'm not liking the suffix. mist seems to confuse and mislead to cover and conceal, why would a cat want to be named for that? that's not very honorable at all.
shellstripe - 7/10, it's better than the first two but I'm not sure about shell-. there are lots of different kinds of shells -- turtle shells, tortoise shells, sea shells, etc. that doesn't accurately describe the cat's appearance, even if it may look like some kind of shell. -stripe would be just fine though, as long as they are a tabby with rather striking stripes.
lilyclaw - 10/10, a neat name, I like it. as long as the cat has mostly white fur and is a good fighter I'd say it's perfect!
mountainfur - 5/10, for once the prefix is the one at fault, heheh. mountain- just doesn't sit right with me. it seems a bit too big and important a thing to name a cat after, and depending on where the clan lives, they probably wouldn't even have mountains. I'd go for something simpler like stone- or rock- or even pebble-. -fur is perfectly fine though, I have no problems with that.
lichenclaw - light grey-brown dappled tom. a strong fighter.
roachfoot - a wiry dark brown tom. light on his feet and sometimes uses his stalking abilities to snoop on other cats.
stonewhisker - short and stocky grey she-cat. excellent hunter, is a fan of catching small and quick things to show off her abilities.
blackflower - calm, even-tempered black queen. her current -- and fifth -- litter of kits is raised just as well as any other of her previous ones, and very very well at that. patient and trusting, but can be a bit overprotective.