Poplar - We generally use poplar for standard custom drawer inserts. Poplar is a hardwood with yellow undertones and often has pale green streaks running through it; less often it has very dark brown streaks; rarely it will have a flaming purple streak. All but one of the custom insert photos on this site is made of poplar. The image below shows the typical color variation seen in poplar.
Maple - We offer maple at a 20% increase over poplar, and it is the only wood choice for our taller organizers. Maple has a more consistent color. It is light in color with pink undertones; it is harder and heavier than poplar. The photos of the Custom Jr. are made of maple. The image below shows the typical color variation seen in maple.