I had been messing around with different packages in Ubuntu for a few different things and after installing and removing a few packages (I can't remember exactly which ones) my entire display is now messed up. I can log back into my GUI but when I boot up it says that it can't load the default human theme and starts up the default log in screen. Then I get in and the panels just keep flashing and I can't click on anything except the X'd out icons on my cairo dock.

Is there a way to reset all themes and reset the original Ubuntu display/themes?

Use the following in a terminal...should do the trick
sudo apt-get install human-icon-theme human-theme ubuntu-gdm-themes

And if you want to know what you installed and removed,
and when :

sudo cat /var/log/dpkg.log | grep "\installed\ "
sudo cat /var/log/dpkg.log | grep "\remove\ "
sudo cat /var/log/dpkg.log | grep "\purge\ "

Other 'logs' : dpkg.log.1 dpkg.log.2.gz , etc.
For gzipped logs use 'zcat' .
.....