After re-reading the entire series a few weeks ago I found myself quite disappointed at the lack of high-resolution crests for the Houses. So I set out to change that. At the moment I've made a high-res Gryffindor crest and I am half-way through the Ravenclaw one. Hufflepuff and Slytherin will be made in due time.
All of these will be under a Creative Commons license. This means any of you are free to use them for your own signatures, artwork or anything as long as it is not:
2. Modifying my work too much.
I hope some of you can make use of this though.
Link to 2066x2687px resolution one
Thread will be updated as I finish the other ones.