I had been messing around with ideas a few years ago and came up with this very simple pattern:
Free Blanket Pattern
Yarn:
Approx 200g DK of any colour (it also looks nice by alternating 2 colours, mc with smaller needles and cc with larger needles)
Needles:1 pair 3.25mm
1 pair 5mm
Tension:
Not important. Increase/decrease sts if required. Needle sizes can be changed also for different effects of the small/large stitches.
Pattern:Cast on 120sts with 3.25mm needles
Gst 8 rows
* Change to 5mm needles
Gst 8 rows
Change to 3.25 mm needles
Gst 8 rows**
Repeat from * to ** until blanket is the desired length.
Using 3.25mm needles cast off.
Do not sell this pattern, it is free for all.