Looking for colorful macro algaes or sponges

As many of you know, I work at the Omaha Zoo and we're undergoing a huge renovation of the aquarium and it's set to re-open up in the spring(April). As part of the new renovation, they're doing a "Keeper's Choice" exhibit and my choice was Dwarf Seahorses(H. zosterae).
To keep the post short, I'm looking for some real bright and unusual macro algaes or sponges to bring the best colors out of the seahorses! I'm hoping for donations, I've got corals to trade, but if you need money I can give a few bucks, but the money's coming from my pocket so not much! haha
Anyways, this is a chance for you to donate some awesome macro algaes and sponges to have them put on display at one of the best public aquariums in the Midwest! I've got a couple cool colored algaes, but no sponges. We have plenty of chaeto and halimedia.
Thanks for any help, I'll have a hobbyist table at Spring Fest to arrange any pickups/trades!
-Adam

 

Gracilaria is awesome, it was one of the macros I was really hoping for! Are you going to be at spring fest?

 

The tank is 2' x 2' x 2', so as much as you're willing to bring. I can get you a coral for your troubles. Just look for my table.

 

Just a last minute reminder to anyone who may have some bright macro algae for me! Thanks anyone!!!!

 

Thanks for the offer, but i ended up going with a symbiosis themed tank instead. The dwarf seahorses didn't do well in such a big tank (for them) and now I'm breeding them off-scenes.