nope not possible fox also hellstone and mud and some more of the terrain textures are not placeable on planks and beams (and logs etc.). If you try a number e.g. item woodplank 1 8 you get a woodplank that says it is ID 8 but the actual texture on it is the stone ID 21 texture
you can swap an unliked texture with any texture you like, but if someone has used it the swap will change there build oO
in fact use id 36 as its unused
ok i changed the block 36 to give it a new texture its sort of snow looking maybe you can test it out or upload a image you would like and i can make that work for you
to install use 7zip
goto your game folder something like Program Files (x86)\Steam\steamapps\common\RisingWorld\data\assets
open the textures.jar file with 7zip Note: dont unzip just open to view files, then click on the Constructions folder to open it
use 7zip to unzip the blockid36.zip file
then use your mouse to drag the two unzipped files into the Constructions folder, it should pop up asking you if you want to copy the files over, click yes
once the files are copied over restart your game.
Note always make a backup of your texture file before doing anything, this way if something goes wrong you can just copy your backup back over your stuffed up file lol
To spawn the new texture just type in the command panel item woodbeam 64 36 or item woodplank 64 36 ect ect you know the deal