How can I decorate a hard cast?

My injured foot has not healed after a year in a soft cast (“walking cast,” “boot”), so we are now trying immobilization in a hard cast as a last resort before surgery. As of yesterday I have a solid hard casing from just above my toes to just below my knee, and I’m lumbering around slowly and painfully on crutches.

The casting station was littered with glitter fallout. Apparently pediatric casts used to be applied there, and you could get them with embedded glitter. But alas, there was no more glitter stuff (I asked). I couldn’t even get a rainbow-colored cast sandal; someone had picked them all out and left only the black ones.

Casts used to be smooth plaster. You could write on them. You could draw on them. This one has a fine waffle texture like the weave of an Ace bandage or the knit of heavy socks; you can’t draw a smooth line on it. Everything would be pixellated, and lines would be forced to follow the uneven wrapping. I was planning to decorate mine with Sharpies in all colors, but it would just be a mess if I tried to draw on this rough surface.

All the fun has gone out of wearing a cast.

How am I going to make this look less boring for the two months that I have to wear it? I still have to be able to get clothes on and off, wrap it up when I bathe, and sleep with it, so I can’t just glue things all over it.