I call this, "Network". It's the one every new knitter tries from curiosity.
*K2tog., YO*, end k1.
That's it. Same every row and the work thus looks exactly the same front and back. That makes it good for items, like scarves, that will be seen front and back.
This is sport weight yarn. I started with US size 7 needles (4.5 mm). Should have used a size smaller, or else used heavier yarn, for the solid effect I was trying for. Mena made it with extra bulky yarn and large needles, and it looked better than this.
So that's the bottom few rows. By time we get up to the green pins, I have changed to a US size 10.5 (6.5 mm) needle. And then at the top, I intended to use 13s (9 mm) but afterward discovered that one of them had been a 15 (10mm). Very different effect.
This is Broomstick Lace. The fabric is similar, but not identical, on the other side.
It's easy in a way and not so easy in another way. You need a multiple of 5 sts plus edging.
Row one: K, wrapping yarn around needle 3 times in each stitch.
Row two: *Slip 5 sts. from left needle, letting all YOs drop. K these 5 sts. together, leave them on LH needle, then (YO, knit the same 5 sts. together again) twice, for a total of 5 newly-made sts. Repeat to end of row.
That's is. Simple! The slightly tricky part is getting those five stitches to look right. You may have to pull and tug to get them properly positioned.
Just for fun, I put two rows of garter st. before the last repeat, since patterns I've seen have them. Not sure they add anything.
This pattern, I think, looks better in fingering or sock yarn, but I can only guess what size needle. I might try a swatch with a 7 and go from there.