i like to match wolves' colors so:
to match blue: blue, sapphire stuff
to match purple: purple, amethyst, chaosium stuff; darkspine standards
to match dark grey: black, iron stuff; fishy treat
to match orange/bright brown: orange, copper stuff; autumn wildwood set, autumn leaves, jack-o-lantern, citrine dagger, lyla the bunny, orange goldsea standard
beloathed basket, moorbear plush, varani shrooms, companion basket, rainbow stuff all have some existing colors + shades of green
i think companion basket would be a pretty good choice if you like it because it's orange/yellow/purple and you don't get wolves you can put that on often