I'm using Selena on Ubuntu 7.04 (beta version). My Ubuntu look and feel has white text color and black background.
Look at the IDE Talk, Ant Build, Project, Structure ... buttons in the following image to see that Selena fixes the background color of these buttons http://myjavaserver.com/~hatrang194/screenshots/Screenshot%20-%20IntelliJ%20IDEA%207.0M1.png
And in the project structure, Selena fixes the text color (it's black, not white as in the GTK theme) http://myjavaserver.com/~hatrang194/screenshots/Screenshot-Project%20Structure.png
Hope this will be fixed.