I've been doing this stuff for awhile now using the same plotter (an Axidraw). Its great fun, and I used it to make christmas presents this year (eg: https://twitter.com/josephgentle/status/947820082218000384 ). I find it really satisfying to be able to make beautiful art despite having rubbish drawing skills.

There's a whole community of us on twitter sharing our weird creations. Join us at #plottertwitter if you're curious: https://twitter.com/hashtag/plottertwitter?src=hash