Currently, one of the communities that I maintain is a gaming community. It's currently on phpBB3 but using an awful theme for what the community is about. I've used Solaris before on phpBB2 (different community), and it was brilliant, so I know what you're capable of. I would definitely contribute towards development of your phpBB3 themes. Not only for the benefit of my gaming community (they deserve a decent theme), but also for the benefit of all who would use your themes in the future. :)