If you want to use complimentary colours for any image or logo then I find http://www.cssdrive.com/imagepalette/index.php really useful, you just upload an image or give it the URL of an image and it will give you the colours used and light, medium and dark variations of the same colours.
For the Atlassian logo at http://www.atlassian.com/dms/wac/images/press/logoAtlassianPNG.png it shows you that the image is made up of:
#003366 - dark blue
#9fc71c - green
#57afe5 - light blue
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Thanks to everyone who came out today for the lunch AUG - we had some great food and discussion (and ice cream sandwiches to fend off the heat!) The welcome and fun fact was great as well, what an aw...
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