Little cactus generator will be part of an upcoming tutorial on paper.js and generative stuff.

http://sketch.paperjs.org/#S/tVZtb9owEP4rFh+KAwYSWKqqHZOmVnzapmrdt7YfTGKSiMRGjhmTWv77/JbggEu1TTMSwvfcy3PnuxMvPYor0rvuPayJSPIe6iUsVfefmIMc07QkCzAHnKYLGKFpMJndPFGNkSLLxQEbxy66K1KRWxBGMZqFgUQSRmtWknHJMmh9K7H6KKMlrok0oWQH7rHIocKUbIzTFGopK6iAURhKf2HwBjw7hmvB2ZrcspJx6b2/LHGy7uuwKce7eyagUlPq6n6LE7GttQhpRuOS0Ezkk2n3qhL7gK6CjnRg6xQHkxjp3K9CFMWh1IqaTFdbmoiCUXASLSFUEI5M8ZCtMLKv8EUHkE5Jckc2Ig9eniiQRxXOGOr0ZYaaT0aEvn8W0KAqfKNPGa9w6ah+0wKvrol+V3BH/QemGfH4dhjpvI4fU6EG0W/mJzrS6QcefeXrgWSVVINOykOTzqCp16ilPOiWzi/3RfIzGx6YdSzeajBHZVWUZauQcUJo/6RmG1ZHdmKslW21S9S5D+LJZbfixQrqOUNtc8znUdMg6jitZlwhHQ2BbiAztU3n2YIuuh1oa7c4dOIwatjsz5IaTI9p2aynf5q1Oru8KAlU1uZZwKe5zsm0D7i4AA720WD29vqqsdEZu5HHzmWuzt8y37/3LtP/8C77k9XTLj5nkfCicmZ2/J0kQo66rLNZpGb26sfwebxRk2F3XyuPrBwMwWEfq23czpgMcHZcFN6ZFcbVrvENi/BtFynWA6zjHNPt0JqF6EDLazZrzEb/bhaHaBRN37H08pSWx4ZJyWqSyvQF3xJHfq6wCj9b2G6DqKauCopAhX8FwHYIJ2LLKfiqWmNVMsah/ikdpayCARgAKNVl3tJS5hAFgfyWv2883hfn3Xt9Ou7k/5QlJ3it61X3rh+f978B