What budget-friendly ideas work for small under-stairs nooks?

Budget-friendly ideas include positioning a single tall rubber plant on a DIY pull-out tray, mounting an affordable mirror to boost light, or repurposing soft textiles for a pet nook. These require minimal investment but deliver high visual impact and low maintenance. Avoid complicated carpentry or custom shelving that increases cost and upkeep, focusing instead on calm, sustainable decor that fits any budget.