ATC frames by Seven Gypsies work perfectly for this purpose
I have had these frames for artists trading cards since the time ATCs were all the rage, and I am glad I held on to them. They are perfect to display my watercolor magnets. Wish I had at least another one. I have to see if they are still for sale.
Today I am going in to set up some prints, cards, and magnets at the Marketplace @Placita Santa Fe. Excited about this opportunity. More on that later! We will have an open house at the end of October. Hope to see you there!
Rachel Murphree Watercolors 
Rachel, very attractive display. Are the cards originals or prints? You might be able to find some display alternatives on websites that sell or promote baseball cards.
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Thanks Barbara. They are prints mounted on a magnet sheet. Good idea, thanks!
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