This tshirt is for a hackathon. The people who will wear it are mostly developers and data scientists - and they will be mostly men between the ages of 22-40. Because of the demographic, the style should not be too feminine or cute.
Possible feelings/themes that the style could have:
The hackathon is about big data and people will be using very cutting edge tools and techniques. It is also about Open Data and many people see open data as something that will be more common in the future - as if you were talking about Open Source Software 20-30 years ago and said that Open Source was going to be very common in the future.
When I say it can having a feeling of "this is the future", that can mean the future as we imagine it in 2014, or possibly the future as was imagined in another era - for instance, the style in the game Euphoria (https://www.kickstarter.com/project…r-dystopia) feels like how people in the early 20th century imagined the future.
The hackathon is about big data so the style could give a feeling related to the amazing power of using modern data tools and massive compute power to work on 100s of terabytes of data.
The data is Open Data (http://en.wikipedia.org/wiki/Open_Data). The style could give a feeling of related to openness.
The data is web crawl data. Common Crawl (my organization) will be providing the data and Internet Archive may be providing some data too. Our logo is a spider and we sometimes use spiderweb imagery to represent The Web. We also sometimes use linked network imagery to represent The Web.