You can make this simple little scarf in an hour with one skein of super bulky yarn. After the first row, all stitches are made in spaces, so the work goes quickly not having to find stitches if you have knobby yarn.
The example is made with Red Heart Light and Lofty, a super bulky yarn. The scarf can be made with lighter weight yarns and smaller crochet hooks. You can add beginning chains in multiples of 3 to make the scarf the width you like.
The example is 6” by 52”
4.5 oz (127 g)/105 yds of super bulky yarn
Size N/P (10 mm) crochet hook
ch = chain
ch sp = chain space
dc = double crochet
Chain 11. The scarf can be made wider by adding 3 chains for each block wider.
Row 1: 3 dc in 5th chain from hook, (skip 2 ch, 3 dc in next chain) to end of chain.
Row 2: Ch 4, turn. In each sp between 3 dc groups, make 3 dc across row to end. 3 dc in ch-4 sp.
Repeat row 2 until scarf is desired length. Finish off and weave in end.