http://abacus2srqbel7n4r5kkurnq4p7ottewbiwwv277hff4l7gjoj5yx6id.onion/milton_1_9_1_easy_to_use_painting_program.php
It feels raster-based, but it works with vectors. The application is under 2 megabytes and simple to use. There are still quite a few options, including backgrounds, eraser, brush options, layers, opacity, and more.