I like moss stitch, it's a great textured stitch that is easy to remember and reversible. This stitch has a similar look to seed stitch, but the purls and knits line up in a slightly different way. Another thing that is a plus about moss stitch is that it lays flat, coupled with it haveing no "wrong" side it is a great stitch for scarves.
Moss Stitch (flat)
Multiple of 2 plus 1 R1: *k1, p1* k1 Repeat *to* to the last stitch R2: *k1, p1* k1 R3: *p1, k1* p1 R4: *p1, k1* p1
Moss Stitch (in the round)
Multiple of 2 R1: *k1, p1* repeat to stitch marker or end of round R2: *k1, p1* R3: *p1, k1* p1 R4: *p1, k1* p1