Kojo
Kojo 1 is a great tool to learn programming. It reminds me of logo 2 which was my first programming language in 5th grade. Its an interesting way to introduce kids to programming and may be a good test bed to try generators.
Some generated pics:

-
https://github.com/vwulf/ettuge/blob/master/src/main/scala/kojo/cloud_with_flowers_from_rangoli_sample.kojo ↩
-
https://github.com/vwulf/ettuge/blob/master/src/main/scala/kojo/random_shapes.kojo ↩
-
https://github.com/vwulf/ettuge/blob/master/src/main/scala/kojo/ladder_rand_shape.kojo ↩
-
https://github.com/vwulf/ettuge/blob/master/src/main/scala/kojo/with_g.kojo ↩