Liners for clay pots

I have painted some clay pots to match my house trim. I want to drop a liner inside to grow my summer plants. I want to then pull the liner out and move to greenhouse and replace with winter plants. I keep searching for liners to put in the clay pots but not having any success. Does anyone have a suggestion?

 

I'd look for gardeners or nurseries that have piles of
disused growers pots (somtimes)free for the taking. Or buy these?
http://www.greenhousemegastore.com/product/euro-pots/nursery-containers

 

Make your own from landscape fabric, held together with staples (or sewn).

 

Thank you and they match the color I need!