It could contain a normal A4 piece of printer paper- which makes it perfect for displaying a child's drawing.
eBay
Wall Hanging Ornate Picture Frame Resin Embossed Frame Retro Style Baroque Photo Frame for Home Wedding Hallway Gallery Decor
Aliexpress UK
Kris Banks lives in NYC and makes art for children. This is such a fun piece and very colorful. Great for a kids room or playroom. In excellent condition.
eBay
Creative Nordic 6-inch Wooden Double-sided Rotating Photo Frame, Table One-piece Photo Frame, Multiple Combination Photo Frames
Aliexpress UK
Framed 3D art for youth featuring bears, sailboat and plane. Approximately 12-1/2" X 14-1/2". Good condition with minimal wear to the frame. Personalized writing on back. See pictures.
eBay
Acrylic Walnut/Beech Creative Photo Frame Acrylic U Shape Transparent Frame Desktop Wood Wedding Pictures Frame Office Decor
Aliexpress UK
Original hand-drawn illustration featuring a bear character, rendered in a naïve / folk art style. Artist is unknown and piece is unsigned.
eBay
Shadow Box Frame Wooden Photo Frame Dried Flower Display Case Rectangle Acrylic Frame DIY Bouquet Box for Gifts Award Keepsake
Aliexpress UK
.Description. .Title. Eildon Waters .Date. 1980s .Artist. Kaye (Child’s) Roberts .Medium. Oil on board. .Frame. wooden slight ornate gold colored frame. .Size. 59 x 27 cm .Size of work including frame. 84 x 52 cm .Condition of painting. Good Condition. .Condition of frame. Good a few slight scratches. .Colors may differ slightly due to the light when the photo was taken. .Upon completion of sale the back of the work will be papered/framers tape and wall hanging hooks and wire. The work has glass in it at the moment which will be removed for shipping, unless the work is picked up. Glass will not be shipped
eBay
Double-sided Insert Photo Frame Acrylic Photo Frame Creative Transparent Leaf Specimen Display Photo Frame Home Decoration
Aliexpress UK
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10 Types Color Acrylic Picture Frame Diy Poster Picture Frame Painting Hall Bedroom Wall Living Room Picture Frame Display Table
Aliexpress UK
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6/7IN Transparent Double-sided Acrylic Photo Frame Stand With Personalized Photo Frame Photo Ornament Photo Frame
Aliexpress UK
eBay
Adjustable Mold Housing Plastic Housing Frame Molds for Handmade Soap Molds DIY Resin Molds Molds Art Craft Molds Y08E
Aliexpress UK