The photo above is the style that I was aiming for. All I did was to cut it down the centre front panel, and then hack the arms off with a pair of scissors.
I really liked the look of the short sleeve cardi. I didn't like the fact that the arm holes were actually cutting off my circulation. I have my hands on my hips in the photo because the arm holes were so tight that I physically couldn't put my arms by my side.
Luckily for this project (unluckily for when I actually try to buy clothes), I have really narrow shoulders which are quite out of proportion to the rest of my body. My shoulders are actually the perfect size for my poor little shrunken jumper.
I kept hacking at the arm holes trying to fix the problem, but it seems that the arm holes had other ideas, so I hacked off the arms entirely...
At least it's a beginning - I'm looking forward to trying out some felted refashioning projects after looking at even more inspiration this week here and here.