I found this mini cassette lamp not too long ago (I stink, because I didn't write down the source!).. and I think it's just ingenious. Imagine if you were to make a huge version of this using full sized cassettes?
When I discovered this, I thought that I'd like to try making one for sure. If you find different plastic cases - the lighting will vary. Alternatively, you could use old tapes with writing on them, and get as creative as you feel inclined to... which makes this project even more fun.