My final year project of my undergraduate degree was comparing the Lotka-Volterra equations to an agent-based model of predator-prey dynamics.
It wasn't so much predator-prey dynamics that interested me - it was the agent-based modelling. Though I do like when software has some link back to nature, one way or another.
I really enjoyed it, from memory. I definitely had more of an affinity for the agent-based way of doing things, rather than the differential equation approach.
I got an award for best final year project.