Little b and q are made similarly.
Background fabric is added at the top. Keep in mind that this will determine the maximum height of your letter - the taller the bit of background, the taller the letter (although you can always cut it down).
And then a strip of letter fabric goes along the left side. A q is the same as a little b, altho this time I chose to add an extra little dash of character.
And here are all four little letters:These aren't hard at all. Just think a minute before you add the next bit. And speaking from experience, don't think you've forgotten to make a p and meanwhile you have that extra d.