Cockatiels are ground feeders in the wild. They very often search through patterns and carpet naturally foraging. If you are trying to switch to pellets, sprinkling them on your new patterned sheet may do the trick, since he is naturally exploring for good.
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Cockatiels:Battle, Sniper, Jackie, Honi
Blue Headed Pionus: Mel
Green Cheeked Conures: Flick, Cache, Titan
Indian Ringeck Parakeets: Blue, Kamehameha, Ka'iulani, Kahili, Shadow, Ali'i, Noni, Pono, Smokey, Hapu'u