There's another source for this sort of material. I found it at Michaels craft store but it's not listed in their online catalog.
I do see it on Amazon though after searching for a "Googly Worm". Amazon only shows it in solid colors.
Michaels (at least the ones near me) has several two-tone versions. Each spike starts in one color and ends with another. I think there's some real possibility here but have only played with these a little bit at the tying bench.
Walgreen's web site shows they have at least one of the two-tone models (dark blue with pink tips). I found several two-tone colors at Michaels that start with a very light (white or light green) and the tips are orange, or purple or various other colors.