Plant it to grow Display Block. "Use" nearly any item on this block to store it inside on display. Destroying the block will spit out the item, or you can wrench the block to remove it.
Display Block Seed price in Growtopia: sells for about 3 WL, buyers pay about 3 WL (median of 16 offers from community Discords, past 30 days). Live price chart and the latest buy and sell offers.
Recently sold at: VERLICASHOP, JTONN, SGYAA, NASTYMALL, HY78