When Project Orange started, one of the ideas that was going around was to involve the community by having them make props or scripts. Probably the team reasoned that it was more work to coordinate such a community effort then it was to make all the stuff by themselves. Also, how do you involve a group without giving away too much of the plot? Once the team buried themselves in their work we didn't hear from the community effort again.
By now (I've been a bit lazy in reporting this), the subtitles are already covered but the call for textures still stands. If you'd like to help out, please head over to the Orange site. Do note the strict conditions though: all the submitted textures must be absolutely rights-free as they will be published under the Creative Commons license.