Chocolate I suppose.

Roxy's is sort of.. caramel I guess?
Lily is licorice with a hint of caramel, and marshmallow.
Skye is very multicolored, so maybe skittles?
Gizzie is caramel, orange marmalade, marshmallows, and other things.
Dipstick is like Honey, hence "Honey Bear" hamster.
Sebastian is like pink cotton candy, with hints of red licorice thrown in.
Neptune is like blue cotton candy, with hints of purple and red licorice, too.
Ariel is like a big wad of blue gum.
Melody is... ?!
I'm too lazy to describe the others.