Originally Posted by
loisf
Maybe you could use a heavier thread for quilting.
ditto!
I did some FMQ and line quilting with a coarser thread. It was nice and showed wonderfully. However, so did the not so well stitched sections. After that, I switched to a finer thread, to help hide the less desirables ... and as I get better, then will consider the coarser threads again.
Some other things to consider ... the batting will effect as to how well your quilting shows. Also, the closeness of your quilting. Plus the colour of thread you have chosen. More contrast, and it's likely to be more noticed.
And as you already mentioned, quilting will be less noticeable on prints than plains.