We used the Carved and Candlelit set, generally used to create Jack-0-lantern cards and scrapbook pages. We stamped the "pumpkin" stamp in Old Olive ink and punched a single flower from the Spring Bouquet Punch from pink CS. Trimmed the flower down, with scissors, because it overpowered the cactus.
Please note: this is not my original idea...my friend said she saw a card that used pumpkin stamps to create a cactus. I case'd the idea from some cards I saw here on Splitcoast. I can't take credit for this idea, but thank you for the kind words.