I bought about 50 panels of camo fabric from a guy for 6$ each. they measure 45 wide by 60 long.
This took a panel per large cushion and I got 2 small cushions out of one panel on the others.
It's a little messy looking from being sat on, but I am happy with the outcome. I still have another couch and loveseat I need to complete. It was fairly easy and I am pleased.