TextCritical.net

This might be a good library for generating the title image: http://cairosvg.org/download/

Cover images should be 4:3 aspect ratio: http://www.thebookdesigner.com/2011/10/e-book-cover-file-size-specifications/

See here for hints on making the title page: http://beranger.org/2013/05/13/correct-your-cover-in-epub-files/

These might make good backgrounds:

• http://mycolorscreen.com/wp-content/uploads/users/greerrrr/blue-texture.jpg
• http://fc05.deviantart.net/fs71/i/2012/227/3/3/medieval_texture_stock_2_by_alexanderhuebner-d5b8ddn.png

Some info on good covers for eBooks: http://wiki.mobileread.com/wiki/Ebook_Covers

Note that this site suggests using a 592×900 image.

Might also want to add body { oeb-column-number:1; }, so that cover is never displayed using multiple columns (http://blog.threepress.org/2009/11/20/best-practices-in-epub-cover-images/).