I think at least one church in the UK has placed a LGBT rainbow flag outside their church. This is a widely-recognised sign of being LGBT-friendly. Also, at least one UK Unitarian church hires their premises to the Metropolitan Community Church. Another thing you can do is to arrange to talk to your local university's LGBT group about liberal religion - where I live, the local MCC minister has done this and I hope to do a talk this term. Reaching LGBT teens is harder because they are more isolated - but you could offer to do a talk at your local school.
Standing on the Side of Love has a section for congregational resources.
In the 1970s, Golders Green Unitarians held meetings of Integroup, a sharing group for LGBT people and allies. Dudley Cave, who was a member at GGU, was a founding member of the Lesbian and Gay Switchboard.
Stonewall also has excellent resources for schools.
- The Trevor Project - a nonprofit endeavour established to promote acceptance of lesbian, gay, bisexual, transgender and questioning (LGBTQ) youth, and to aid in suicide prevention among that group.
- Scarleteen - sex ed for the real world
- We are the youth - photographic journalism project chronicling the individual stories of queer youth in the United States
- "I'm From Driftwood" 50-State Story Tour: Collecting and Sharing True LGBT Stories.