They have the same color and texture as bamboo plank wood. As mentioned by the developers, they come under the wood-type category of Minecraft 1.20 update. Here's a list of what can be crafted ...

For a more rustic feel that goes right along with Minecraft cottagecore, Jicklus is a great texture pack to consider. The 16x16 resolution textures increase the definition of each block and item ...

The update also introduces a ton of new blocks, plants like bamboo and berries and much ... The extraordinary Minecraft Texture Update has been available at minecraft.net for quite a while ...