these are interesting. The circular ones remind me of the ten network logo from Australia. I think the last one on the bottom right is really starting to look like more of an identity and could be developed into something really dynamic. Remember to think beyond just the logo and how it could be developed into a brand and possibly a marketing campaign.
Another good example that was in computer arts was the BBC Three re-brand that was done a while ago.
Haven't had chance to have a proper look for a link to that particular article but here's a similar one from Creative Review that may be interesting for you....
http://www.creativereview.co.uk/crblog/bbc-three-–-rebranded/
It's always a good idea to rationale your ideas based on your research as part of the project...so you could refer to these articles in your documentation.