I don't actually own any theater posters but had an interesting commission a couple of weeks ago.
One of my friends works for one of the largest marketing/design companies that specialises in West End Theater design. He'd just finished designing all the material for Hair, which has just come over to London from Broadway with the full award winning US cast (which is unheard of I think as the expense is mahoosive!). The only problem was they wanted to give a gift to all the top Broadway Producers coming over from NY for the opening party but didn't have a plan.
Because it's a 60's hippy, peace, love and CND symbol type show my mate thought of my stencil art... to cut a long story short I got the commission to spray a limited edition of 12 artworks to be given to these people (I did three differently coloured versions, four of each). Below is my favourite, the green one, and then a photo of a blue one how they were framing them to give out.
No biggy really, just thought it was related as time was very short and I had to use their existing graphics for the painting.