This is what I've been doing with banana yarn and cotton. The swatch on the right is just banana yarn. I started with plain stocking stitch and then tried out some seed stitch and some bobbles. It's nice and shiny and gets softer when washed, but I'm not too sure what to do with it on its own and I've only got 200g. My first idea was a bag, specifically Coco from Magknits, but trying out the lattice pattern made it clear the yarn's just not smooth enough for the cables to show clearly.Then I remembered the purple cotton I used last year to make a spring/summer cardigan (not worn much and now too loose since I've lost weight). So I experimented with putting the two yarns together. Holding them together gives just a little bit of shiny silk sparkle and adds weight. The bobbles were done with just the banana yarn. I like the effect, it would make a good sleeve border. Possibly not round the bottom of a cardigan though. I also tried some split stitch, as used in Revolution, although I hadn't quite thought about the maths and ended up with more stitches than I started with. I like the effect, when I get it just right, but getting it right is a fiddle.
I'm still not sure what this is going to be. A cardigan would be useful.