If you are doing an all over design, this won't work, but when I do motifs inside blocks, I trace them once onto tracing paper, then take a stack of like 8 sheets of paper, and sew over the design with a needle without thread (to perforate). Then I sew over the tracing paper when doing the quilting. The perforation makes it easier to remove the paper.
For me, this is just the easiest way. I got the idea from Geta:
http://cadouri-din-inima.blogspot.co...ting-tips.html
Before that, I never marked designs at all.