Fun D&D monsters

[Melancholy_Ocelot]

So...4 friends and I are going to roll up a few lvl 12 characters this weekend and fight some random monsters.

I have a few objective based encounters planned, Colosseum fight, take an enemy castle wall, and taking a defended bridge and hold it for X rounds.

I'd like any suggestions you guys have pertaining to fun monsters to fight. Big ones, small ones...anything that will be challenging yet fun.


P.S.
We're using 3.5 rules.
So far we have:
Hybrid WearBear Cleric
SoulKnife (me)
Gravity Warrior (found on d&d Wikis homebrew)
and 2 unknowns.

 

[Racthoh]

My vote goes to the Rust Monster.

 

[Melancholy_Ocelot]

I was thinking of something with a higher Challenge Rating.

At lvl 12 we will be one hitting all of them.

 

[Altorin]

Dire Owlbear. A Whole Army of them.

Owlbears ftw.

 

[Melancholy_Ocelot]

Thanks for the 2 whole posts.

Don't worry, I had way more responses from 4chan. They seem to care more.

Maybe next time I'll title the thread "what does your avatar mean". Those seem to get way more attention.

 

[XzarTheMad]

Maybe there just aren't that many people around here who

a) Know enough about D&D to suggest monsters off the top of their heads
b) Have enough experience with D&D to know what monsters are fun to fight

Personally I'd help, but those points pertain to me. I simply don't know enough. I'd suggest checking out Something Awful's "WTF, D&D" section. They deal with weird monsters in the D&D universe. Good luck to ya.