For us here, the best yarn to create beautiful colorwebs would have to be Colinette Point 5, available from a number of on-line yarn shops.
Enjoy!
The images below show you how to cast on, basically using the European long tail method and turning your hands into needles....
Next comes turning the row which is done by transferring the stitches to the other hand.....
...followed by knitting, using only knit stitches, effectively knitting garter stitch.......
Continue this way until desired length is achieved, pulling on the work to align stitches as shown...
...then cast of as you would with needles....
..continue across all stitches and thread end through stitches, cut and there you have - your own colorweb!