Since I had to make a few more triangles, I did the "jog over" technique using my 1/4" quilting foot so I could take a picture. Typically I use light grey/slate blue and beige threads to piece with, I have one color on top and one in the bobbin. They do well with scrap quilts and mostly disappear so you can't see the grey line I sewed first. Again, if you don't have a foot that gives you a good seam allowance on both sides, I really recommend drawing the lines to the left.
I changed to the rusty color -- you can see that clearly! While I did this with squares, I mostly use it when I'm doing a bunch of triangles into HST... turn every other one so it's a straight run -- you might still get a couple sucked down into the plate, but not nearly as many as otherwise.