The Book of Kells in its entirety can be viewed online as part of the Trinity College Library’s digital collection. We were lucky enough to see it was exhibited at the National Gallery when it came to Australia, but I have been enjoying quietly browsing it online.
The pages are photographed at a very high resolution so you can zoom right in and closely examine the designs. I love the complexity of the patterning. Of course there is the main imagery but I keep noticing the little areas of decoration tucked in corners or in little out of the way area and marvelling at it. I just had to share!
There is also a new iPad app of the Book of Kells for folks with a tablet