alice brans posted These are crochet lamp shades, but I believe the same could be done with knit. Not much different than knitting an oversize hat. to their -crochet ideas and tips- postboard via the Juxtapost bookmarklet.
Either this or the green glass lamp- I'm leaning toward doing something similar to this using bright green and blue for the centers of the motifs, and bright white for the edges. Probably a simple clear glass or white lamp base.