Hello tiny,
What I first tried was some cork ready splitted in a plastik bag for 1,30 ( for a full hand of it - much too expensive for my Diorama but worth for a try) for Dioramas for H0-trains. Now IŽm going to search for more material - perhaps some stuff for the ground of your house. Corks for wine are ok but who will drink so much wine... I hope that IŽll find a solution. IŽll post more later.
beetyii