Making flower pots
You can make most bowls, tubs, plastic items into flower pots. Just make sure they have good drainage holes.
i use everything for that even cans https://www.hometalk.com/43346709/planters-quick-diy
Most containers that hold water will make good planters, as long as you can drill drainage holes in the bottom.
lots of ideas/videos https://www.youtube.com/results?search_query=DIY+make+flower+pots more https://www.youtube.com/results?search_query=diy+plant+pots+clay more https://www.youtube.com/results?search_query=diy+plant+pots+ideas more https://www.youtube.com/results?search_query=diy+plant+pots+plastic+bottles Recycling objects as planters-- go to Goodwill/these type resale stores or garage sales,estate sales and buy dishes,pots,pans,vases,coffee cups,teapots,crystal ware,glassware,candle holders,old silver containers,copperware anything that will hold your plants. You don't really say if you are asking about inside or outside?? outside you can use any large rope tubs,sterilite/rubbermaid containers,wood boxes,dresser drawers,large pots or pans,dishpans,tires,old tubs,sinks,aquariums,wire baskets of anykind,pallets,window boxes,shoes,boots,old clothes/material dipped in cement