Tips For Designing Posters

1. Choosing the correct font for your poster is important. Not all fonts work for your poster. The font should be "readable, clean and vivid for clear communication " and it should be stylish but readable. Also it should be creative and experimental when trying to be decorative.

2. Colors should complement eachother. Colors should not intefer with eachother and make the poster look ugly. Colors that work well together make the text and images look better.

3. Use the rght images. Images are good for communicating your message so use the right ones. Depending on whether there is text also makes the image more or less important.

4.  Use white space to avoid clutter. A lot of pictures and words make the poster look congested. To balance out a poster use a fair amount of blank space. White space makes the poster look organized and draws attention to the right details.

http://blog.signalnoise.com/2009/08/08/wordburglar-tonight-at-the-seahorse/
I like it because it's cool. Nice colors and the repeating background shape are nice.