Here they are! Every texture found in the levels of Munch's Oddysee are here for your downloading pleasure!
http://www.megaupload.com/?d=I8ZM5J27
Just unzip the .rar and you're good to go!
EDIT: You can see the textures contained in the folder using this program...
http://developer.nvidia.com/object/dds_thumbnail_viewer.html
After it's installed, simply set the folder you're looking at to thumbnail view.