Nick Trudgeon is a top aviation artist and has created many works of art. If you visit his website you can view his pictures but there is also a better quality link by each picture to see it in higher resolution. Each image contains a watermarked signature but it is not distracting.
The size varies in height on all images, but each is 1701 pixels wide. They make a great screen saver or desktop theme. Anyway I visited the site and downloaded what I personally feel were the top 99 images and then put them into a zipped file.
It can be downloaded here:
http://www.mediafire.com/?8a7jynwupbdyygv
Nick Trudgeon's website is here:
http://www.nicolastrudgian.com/
Cheers, MP