Homemade 6 inch tall stands for small floor stranders

I like that!!!  Get some of that Flex Seal rubberized paint and paint them and put extra coatings where the speaker will sit and then the bottoms shouldn't get scratched up, I would think.  

Used bookstore, a few unwanted hardcover books (encyclopedias, dictionaries, etc.), a handful of long screws. 

Thanks all, interesting stuff...

I'm thinking a few old textbooks from the basement might be just right...

That might resonate, but the long screws might be the answer.  Years ago, I was re-doing a room and used two 5 gallon cans of joint compound for a 12'' speaker stand, probably the best speaker stand I ever used.