...although half the point of the exercise was to learn how to do something new.

Get a file with stupid quotes. Use MBROLA (http://tcts.fpms.ac.be/synthesis/) to produce a Text-To-Speech WAV file, using a different voice every time. Mix the file with your existing file. Encode as MP3. Stream.

You don't have to solve easy tasks in a complex way. There are enough challenges out there. You just need to look for them.

And for someone who pays you to do it.