My boyfriend loves theatre, coffee,foreign language and culture, reading and building (mostly sets for theatre productions. ) Does anyone have any good gift ideas?Something original.Not just theater tickets, a tool set ,or something.

Sounds like an interesting boyfriend!

How about a billboard that you would normally hang in a theater from a musical or play that he likes? Or, any memorabilia from those same things.

A signed autograph with a short note made out to him from a famous actor or actress.

Autographs from famous actors or actresses that you might find in an antique store. For instance, on old sheet music of a song in a show that they may have sung. I have seen quite a few of those in antique stores.

Just some beginning ideas...

A nice gift certificate made from you either by hand or on the computer, sprayed with perfume, that says something like "Once you build the next set, turn this in for a free one hour massage" and include some massage oil. Cheap, forward thinking, something he wants, and something he can look forward to.

I would seriously consider looking online for some ideas for his gift. It sounds like you have a good handle on the things that he likes, it wouldn't be super hard to find something that works.

Why not an "all-in-one" day together?
You can get him a book in a foreign language he speaks (or wants to learn) or one of those "getaway" photograph books (I like the "Earth from above" series from Yann Arthus-Bertrand) take him to a very nice coffee place (or, depending on your budget, a Keurig K-cup machine costs around $140, boys love them!) and maybe end the night in a theater after dinner?