I used nine different colors for this blanket, 2 skeins each with some leftover.

The blanket measures 24x36 inches. You can increase the width by casting on more stitches and increase the length by adding another rainbow. The pattern is easy to adjust.

This is the explanation for the pattern abbreviation, just in case.

row 1: k2, turn
row 2: p1 slip1
row 3: k3 turn
row 4: p2 slip 1

row 5: k4 turn
row 6: p3 slip 1

row 7: k5 turn
row 8: p4 slip 1

etc,
until you get to

row 17: k10 (do not turn)

I like this tutorial as well if you are new to entrelac:

http://knitting.about.com/od/knittingskills/ss/entrelac-b...