/setblock ~0 ~1 ~0 minecraft:chest 0 replace {Items:[{id:minecraft:banner,Count:1,Slot:0,tag:{BlockEntityTag:{Base:7,Patterns:[{Pattern:rs,Color:15},{Pattern:gru,Color:4},{Pattern:ss,Color:1},{Pattern:bts,Color:0},{Pattern:mr,Color:9},{Pattern:ld,Color:11}]}}},{id:minecraft:banner,Count:1,Slot:1,tag:{BlockEntityTag:{Base:15,Patterns:[{Pattern:ld,Color:7},{Pattern:vhr,Color:11},{Pattern:tts,Color:9},{Pattern:bo,Color:9},{Pattern:gra,Color:13},{Pattern:gra,Color:5}]}}},{id:minecraft:banner,Count:1,Slot:2,tag:{BlockEntityTag:{Base:11,Patterns:[{Pattern:dls,Color:3},{Pattern:bri,Color:4},{Pattern:cs,Color:2},{Pattern:rd,Color:8},{Pattern:flo,Color:4},{Pattern:sc,Color:9}]}}},{id:minecraft:banner,Count:1,Slot:3,tag:{BlockEntityTag:{Base:12,Patterns:[{Pattern:ld,Color:10},{Pattern:dls,Color:1},{Pattern:flo,Color:1},{Pattern:bt,Color:13},{Pattern:ss,Color:5},{Pattern:vh,Color:4}]}}},{id:minecraft:banner,Count:1,Slot:4,tag:{BlockEntityTag:{Base:2,Patterns:[{Pattern:cre,Color:6},{Pattern:ls,Color:10},{Pattern:flo,Color:10},{Pattern:br,Color:12},{Pattern:hhb,Color:11},{Pattern:br,Color:12}]}}},{id:minecraft:banner,Count:1,Slot:5,tag:{BlockEntityTag:{Base:2,Patterns:[{Pattern:cre,Color:6},{Pattern:ls,Color:10},{Pattern:flo,Color:10},{Pattern:br,Color:12},{Pattern:hhb,Color:11},{Pattern:gra,Color:12}]}}},]}