The easiest way to protect your bike from scratches.
Acrylic yarn balls (3 different colours were used in the DIY)
Crochet hook (size required by the yarn)
For the frame:
You need to crochet 4 different grannies squares. You can look for different designs on Pinterest (and Ravelry as well). Once you have finished your grannies, you need to sew directly on the frame (and they will fit perfect on it).
For Skirt Guard:
I have purchased this pattern. In case you have a very good skills on crochet, you can try to crochet your own skirt guard, but this pattern was very easy to follow.