Fun Stuff to Do with an AWS EC2 Instance?

Finally had a chance to sit down and figure out my Amazon Web Service Account a little bit. I got as far as making a few EC2 Instances both with ubuntu and windows server. Pretty cool technology. I Remote Desktop (RDP) into the windows server with Remmina from my local Ubuntu box. Or SSH into the Ubuntu instance. Playing around with saving the disk images and just opening up an instance on the fly with it's own temporary IP. Then terminating the image. Rinse and repeat.

Any one know any cool stuff to do. As far as I under stand it's a dynamic IP. The only thing it says Amazon ISP. Would this be useful for traffic? Is an Instance better then a proxy since it's apparantly created on the fly?

AWS IPs are as banned as it gets.

Would be cool to run a Space Engineers server I can turn on and off