I'm just like you. It's either a grid or the curvy line. (One of my goals now that I'm retired is to get proficient with my Brother 1600 and my Little Gracie frame and maybe try some FMQ.) Anyways, when I do the curvy line, it's a gentle curve back and forth like a lot of big "Ss". Sometimes I do it top to bottom and side to side, sometimes on the diagonal. I use the walking foot and I always start by making an "X" or by going top to bottom, side to side in the middle to anchor the quilt. I start this in the middle and then go out to the edges all four ways and then after this, I just go edge to edge. Don't diss the grid though please. I like the way the grid looks if done evenly which can be a skill on to itself. I once had a quilt shop owner tell me she could never keep the grid evenly spaced and was impressed with my being able to.