If any one is Building WWI ACFT I think you’ll find an interesting list of reference sites on the Links Page of :
WWI ACFT COLORS @
also @ www.theaerodrome.com/forum/index.php
http://www.imagestation.com/picture/sraid87/p1318b3996dbe8433aad32e45d0b8052d/fa9bec0d.jpg.orig.jpg
http://www.imagestation.com/picture/sraid160/pa168015dc2554ac26d23b4d2ae78b003/f4dc8413.jpg.orig.jpg
http://www.imagestation.com/picture/sraid85/pf43a6f7159207d9a9fdcb0ce823d6ba0/fab5aef4.jpg.orig.jpg