I've always felt the Primitive Doll should be a better curio than it is, given its material requirements. Not that it should be a great one, but as one of the curios that's easily available early game I'd like to see it given more love. Maybe something on par with the Hedgehog Quills?
I'd also love to see the (now crappy) curios that are an itsy bitsy's web and the itsy bitsy spider able to be combined into "A Spider's Parlor" or something similar that's at least a half-way decent curio.