Here are a few websites that have general meanings and/or symbols for each of the tarot cards:

Arnell Ando – examples of the Major Arcana
http://www.arnellart.com/movietws.htm

Arnell Ando – Keys for the Minor Arcana
http://www.arnellart.com/keys.htm

Arnell’s home page – check out her articles on other tips on making a collage deck, some very good information here
http://www.arnellart.com/frm-main.htm

Some links on collaging a deck by Michele Jackson:
http://www.tarotpassages.com/create.htm

Robert O’Neill’s in depth study of the iconography of the major arcana:
http://www.tarot.com/about-tarot/library/boneill/

An awesome feature on Trionfi.com, it shows the different cards from about 200 decks grouped together so you can scroll through them and compare:
http://trionfi.com/0/i/c/ALL-78/