If you want to work two colors and have the back look good, then you should probably make the scarf doubled and then seam it up the side. Intarsia really doesn't look great on the back.
If you want to work in one color, you can do that easily. Work the background in garter and the symbol in stockinette. That seems to work best.
"Trust the pattern!"
Time flies like an arrow, but fruit flies like a banana.
Hop aboard while we follow the cloud-covered van of knitting harmony, man!! Woooo!! --Hedgehog
IngridKH on Ravelry