100 Pack Adjustable Frame Corner Protectors, Multi-Depth Cardboard Corner Guards for Art, Moving, Packing, Shipping (Fits 2.5 to 5.5 cm Frames) : Amazon.co.uk: DIY & Tools
Cardboard Pre Cut-Frame A3 10 pack – Educational Art Supplies
50 Pack Self Stick 9 Inch Cardboard Easel Backs, Picture Frame and Art Stand for Painting, Photos, Artwork, Crafts (White) : Amazon.co.uk: Home & Kitchen
Extra Large Mirror & Picture Frame Box | 800x90x600 to 1000mm
30 Homemade DIY Picture Frame Ideas - Suite 101
Cardboard PICTURE MOUNTS to fit A4 Picture Frame Lots of colours & cut out sizes | eBay
3 Easy Picture Frame From Cardboard / picture Frame using cardboard newspaper and tissue paper - YouTube
What Do President Obama, Ornate Art Frames and a Drum Kit Have in Common? Cardboard | Arts Observer
CARDBOARD PICTURE FRAME | DIY frame out of cardboard - YouTube