There were 3 factory types of formica available. Series one cars had a mid brown colour with a fine grain pattern, series 2 had the dark brown with black grain pattern until that was replaced with a pale (almost honey) colour for the last couple of years. However, a number of people have made replacement sets in high gloss wood veneer. Burr walnut and the like, the options are limitless. Thankfully I haven't seen any done in carbon fibre yet...
There was also real wood fitted to the first 1000 or so cars but you probably won't ever see any of those.