Anna, I think it depends on what you want to do with your quilting. I use either bottom line or very fine YLI silk closely matched to the fabric to quilt with when I don't want it to show much and i don't want to use invisible thread. I will say, though, that I used to really not like invisible thread until I tried Superior's. It works wonderfully. If you want your quilting to stand out, and use something like King Tut, remember everything--good and bad--will show, but it could be a fabulous addition to your quilt. As to color, I'd pick one or two main interesting colors and not do a lot of thread changes. I really like both King Tut and Rainbow (both from Superior) and if you go metallic, Superior's are the best--cause less headaches. I sound like a salesperson for Superior, but I am not...they just make some of the best thread out there. Look forward to seeing it finished. Have fun quilting it. Looks great so far. Cheers. BJ