A simple r could look like this:
A simple n would just have a strip of letter fabric down that right-hand side (an upside-down u). An m and w would be an upper-case E knocked over. I made Star Light with letters this way. Oh, and you can make m and w just like you made the upper-case ones.
I like angles, so I make my letters like this:
Start with a rectangle of background fabric and slice across it somewhere in the upper region. Kinda goes up and over to the right.
After you've added the strip on the right side for the n, it looks a bit bizarre like the example on the left and the one at the top of this post. You'll lose that weird spot once you lose that top seam allowance, like the example on the right.