>>96334002
You can get textured plastic sheets. Get a circle cutter or a hole punch the right size and you can just glue them to the top of your bases before mounting your minis. Some companies that do mdf terrain also sell laser etched cardboard of mdf toppers in common basing sizes these days.

Failing that just using regular plastic sheets of varying thicknesses is also a very easy and effective way to do stone floors. Also a good alternative for slotta bases or puddle bases if you cannot be arsed to cut the extra metal off and pin the metal to the base. You just have to cut the tiles yourself first, but you can get very nice results for little work. Press some coarse sandpaper on some tiles, file bevels, crack tiles etc for extra detail.