Being a previous yearbooker myself, I'd say that '10 is a huge opportunity for schools out there to take advantage design-wise.
For a cover, I'd almost recommend something minimal. Maybe a navy background with two white lines that would have ten photos inside covering the back and front, and then with your theme ATTENTION below in a gold, simplistic font.
If you'd like me to send you some pages from my senior book ('04), I'd be glad to. Or if you'd like to discuss this further, feel free to shoot me a PM. We ended up winning a Spartan Award from the Michigan Interscholastic Press Association that year, so I consider it to be pretty successful!