I like your triangle ideas -- they are brilliant! I make mostly art quilts and sign them unobtrusively in the border -- with a color ink that won't detract from the quilt, but that can be seen. Just my name and date. On quilts given for an important occasion I write more on the quilt backing, sometimes adding flashy beads. I think all our quilts, traditional, modern and art are works of art and signing on the front makes me feel like an artist.