A few questions to put to the 'group', as it were.

1) How many themes can one fit into a poem? Is there a point were exploring themes through poetry just feels like a battery of chickens with words?

2) Do people prefer writing to themes...that is being given a theme and writing about it?

and

3) Is there a theme that you would never explore with your poetry?

I've have about eight recurring themes that I explore time and again in various ways (at the last count), but only because they are the things I get bugged enough by to make me write.

If a poem comes into my head that I like, and that doesn't contain one or more of those themes, I write it anyway.

1. As many as you have the skill to handle
2. Don't know
3. No

Most of my poems are inspired by a particular phrase or sentence which pops into my head. Often when I'm driving. The theme comes later. Occasionally I have been asked to write on a particular theme and I can do that.
As for multiple themes I think a motif can sort of twist into another one within a poem but too many voltas would make the piece unwieldy.
Generally I try to let the theme sort itself out and concentrate on the language. The coherence of the poem should present the theme organically, as it were. I don't usually know what a poem is 'about' until I finish it.

I think that pretty much sums it up for me, Siren. Except to say that I like to think of myself as "listening in" to what the words and the world are telling me. I don't come to the poem with my ideas and themes worked out beforehand. I can write to a theme if given one; but I prefer working the other way. I've heard enough preachers in my time to hate being told what to think by poets.