That challenge was a Winter Card Challenge - simply make a card inspired by winter. Use snowflakes, snowmen, mittens, ice skaters, whatever you want!
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Stamps: SU's So Many Scallops
Ink: Night of Navy
Paper: PTI white and Pure Poppy, patterned paper from last year's DCWV winter stack
Other: SU circle and scallop circle punches, clear spica glitter pen