Anyone willing to help come up with ideas for a boss?

I'm working on a level, I've made a tileset or two, and I need an idea for a good boss character that anyone would be willing to give up. All help is greatly appreciated!!

For a good idea for a boss, people will need to know more about the level you are making  so the ideas might actually tie in with the level. Also, bosses are HARD to make. If you really want to make a boss, be prepared for hours of work with piles of screens and shifts.

Two words. FREE TIME. I have lots of it, so I think I can do it. The level I'm working on would need something like a transformer, simpler, but with some dirt and grime etc. Any ideas?

a super awesome magical robot who uses multiple orbs of death summoned from the water gods of zeus to kill you by using his super awesome water manipulating powers that splits apart when it hits walls

Uhh that's an amazing idea but, it's not exactly what I was getting at... Think more forest/rural area themed. (robot that looks like optimus prime kinda, but is a trailer.

EDIT: Just realized that my original idea was a good one, I'll use that. Now I just need help with the making of the guy. Uhh, anybody willing to collaborate?