I decided to make something similar with my third graders. This project took a day to paint the background with free-form shapes and brilliant colors, then left to dry. On day 2, we only took 10-15 minutes to "blow" the ink into spider-y stems across our papers. (Yes, I used water-soluble liquid black ink, not paint). I just ADORE how these came out. Each so beautiful and unique!
And no, I couldn't come up with a clever or witty title for these paintings. We used this as a springboard to "naming your painting" in class, too. The students loved coming up with names for their own paintings!