I can't resist adding words to my crafts. My first felted bag was embroidered with the words locus delicti which means "scene of the crime" in Latin. I intended this bag to be a book bag for toting mystery paperbacks and maybe a notebook and pen. If I were to redo this bag, I might make the lettering a little pronounced with a darker shade of brown. It doesn't bother me too much that it blends in a bit, since that fits with the mystery theme!
I created this messenger bag from a men's wool sweater that I bought at a thrift store. The strap is a men's belt. A picture of the design was featured in Interweave Felt with a group of projects that involved recycled knits. You can download this free project from Knitting Daily. The instructions are not very detailed, but written more as general notes. There's no knitting involved, just a lot of cutting, sewing, and decorative embroidery after you felt the sweater in the washing machine.
This process, by the way, is technically not called felting, but fulling. The difference has to do with the original state of the material (a finished knit like mine or raw roving). Fuzzy Galore has a pretty thorough discussion about the difference and felting history. Felting vs fulling is quite the hot topic in the knitting world, so consider yourself warned!