Use Bodypaint for the UV mapping. Those wings look straightforward to map - essentially there is an upper and lower surface so use polygon selection tags and interactive mapping the way 'bazze' clearly describes in his nice UV Mapping & Texturing tutorial: http://www.colacola.se/wip_p47.htm

PRACTICE with Bodypaint and you will soon find it is not the complex software that some make it out to be be.