This is something I've been working on lately - a top-down raglan cardigan in Shalimar Yarns 'Breathless'. It's a merino / cashmere / silk blend that is absolutely amazing to knit with. Her colours are wonderful, too. This is shown in 'Glacier' (MC) and 'Gunmetal' (CC).
I have loved welts and ridges for a long time, and I really liked how this yarn felt when folded, so I decided to use welts in my design. The sleeves have three of them which form a sort of extended cuff, and this is repeated on the front edges. Then the top and bottom of the body are hemmed. I think this gives nice structure to the fingering weight sweater, as does the gauge of 26 sts / 4" (10cm). I debated for a time about closures and settled on eyes and hooks on the upper front, so as not to distract from the ridges.
I was also wanting something, similar to the ridge, on the back for interest and came across Erica's ingenius decrease pleat, which she kindly permitted me to use and reverse for a top-down. Overall, pleased.