Based on Smack The Wall - Wall Texture Replacements by Maranatah, except this one is for Castaway Stories... and for foundations instead of the walls (duh).

Please note:

1) This will only work in The Sims Castaway Stories. It shouldn't harm your The Sims 2, but it won't change or add anything either because the texture names and ids are different;

2) It's a simple texture replacement, so it shouldn't conflict with anything that doesn't replace the same texture;

3) You can choose ONLY ONE foundation replacement at a time (concrete, tan stucco foundations or grey stucco foundations). You can, however, combine it with my regular wall or platform wall replacements;

4) Depending on the way EAxis built their Castaway lots you might see those textures in unexpected places. I'm afraid you'd have to repaint those foundation walls by yourself, and if you didn't finish the storymode and can't edit lots yet - well, I'm sorry, but I can't do anything about that. Feel free to remove my replacements before you finish the main storyline.

I think that's all..? Feel free to contact me and tell me if there's anything wrong.