I even salvaged some pellon type "frost cloth" that lowe's used to cover their plants when the temps dropped. They were throwing out hundreds of yards of it...talk about spendy..
I cut the lengths I needed for my own garden beds and made some BAGS to cover a few plants in the flower bed and the rest got cut into 2 yard lengths and washed and folded...
I sewed on 6 1/2" squares the other day and it is amazing...and it can stay as a foundation!