Gather wool blocks in the colors you want
Craft banners using 6 wool blocks and 1 stick
Place a loom
Put the banner in the loom
Add dye to the loom
Select a pattern that helps form the letter B
Use banner patterns if needed for cleaner shapes
Layer different colored patterns to build the letter
Repeat for each banner needed
Place the finished banners side by side to spell B or create a banner letter design