has turned into a ball now:
I'll have a good, long think about what I will do with 745 m of this fine two-ply rainbow. Currently, the thing that sounds most attractive is to take some dark yarn in a similar thickness and eventually knit something wearable in a mosaic pattern.
In case you don't know mosaic knitting - it's a slip-stitch technique where you work with two colours, making incredibly complex-looking patterns that are fairly easy to knit. There's a nice tutorial in a back issue of Knitty to get you started, and if you want more patterns, Barbara Walker has published a whole book called "Mosaic Knitting".