[nanetteclaret]

Google is your friend. Here is one entry, which shows the Catacombs with art work/icons.

http://thenagain.info/webchron/WestCiv/EarlyChristian.html

There are many other entries. Just Google "Early Christian Art" and "Early Christian Icons."

[nanetteclaret]

Here is another link which has a lot of art information:

http://www.huntfor.com/arthistory/medieval/earlychristian.htm