You don't need a sewing machine at all to make one
I took a large bandanna i didn't use, folded it diagonally in half twice and then snipped a hole in each of the corners. I measured it up to the viv, marked the points where i wanted to attach it at and then screwed in three small bracket-type things i had lying around. I tied some strings in the hole of the bandanna and tied them onto the bracket hole. I suppose if you have an eyelet maker gadget you could put an eyelet in to make attaching it easier. Its easily detached, machine washable, you can choose a design to suit your viv and is cheap to replace. Hige seems to love it