DBD
.D.   GRA
.D.   Gradient! (the banner can be in any empty slot)

D..
.B.   TL
...   Top left square

..D
.B.   TR
...   Top right square

...
.B.   BL
D..   Lower left square

...
.B.   BR
..D   Lower right square

D..
DB.   LS
D..   Left stripe (the banner can be in any empty slot)

..D
.BD   RS
..D   Right stripe (the banner can be in any empty slot)

DDD
.B.   TS
...   Top stripe (the banner can be in any empty slot)

...
.B.   BS
DDD   Bottom stripe (the banner can be in any empty slot)

.D.
DBD   MR
.D.   Rhombus

.B.
.D.   MC
...   Circle (the banner can be in any empty slot)

DDD
DDD   HH
.B.   Horizontal half (the banner can be in any empty slot)

DD.
DDB   VH
DD.   Vertical half (the banner can be in any empty slot)

.D.
.DB   CS
.D.   Center stripe (the banner can be in any empty slot)

...
DDD   MS
.B.   Middle stripe (the banner can be in any empty slot)

D.D
.D.   CR
DBD   Cross (the banner can be in any empty slot)

DD.
DB.   LD
...   Left diagonal (the banner can be in any empty slot)

.DD
.BD   RD
...   Right diagonal (the banner can be in any empty slot)

.D.
DBD   TTS
...   Top saw (the banner can be in any empty slot)

...
DBD   BTS
.D.   Bottom saw (the banner can be in any empty slot)

.B.
.D.   BT
D.D   Bottom triangle (the banner can be in any empty slot)

D.D
.D.   TT
.B.   Top triangle (the banner can be in any empty slot)

D..
.D.   DRS
.BD   Down right diagonal (the banner can be in any empty slot)

..D
.D.   DLS
DB.   Down left diagonal (the banner can be in any empty slot)

D.D
DFD   SS
...   Small stripes (the banner can be in any empty slot)

Other elements (combine with dyes to change color):
- Brick block = brick pattern
- Creeper head = creeper face
- Oxeye daisy = flower
- Wither skull = skull and bones