i make my own fabric but not on the small scale that you work in.
now with that said i think you could still produce products that you like - you would dye the background and then to make your designs you could use stamps and paint or even use tools from the house.
to make dots use the other end of the paint brush and you can use window screen for rubbing to make checkered fabric - chicken wire is great for rubbing too.
you can buy rubbing plates for quilts - they make a few styles now and those might work for you but you'd have to check the size mine are about the size of a coaster which might be to big for you.
here's a link to rubbing plates
http://store.quilting-warehouse.com/...aintstiks.html
also there's a line of stencils out specifically for painting on fabric. the small sizes should be able to work for you.
i love these stencils for painting - they're a bit stronger than quilting stencils and can withstand the rubbing and washing.
here's a link to the painting stencils
http://thecraftersworkshop.com/Letter%20Templates.html