I have a large black filing cabinet in my office (almost all the furniture in my office is either black or clear glass). Knowing a blank canvas when I see one, I bought a number of variations of the little word poetry magnets I could find so that idle clients, and my idle children, could make poetry on the filing cabinet from my bright red chairs while they wait for me to complete something. One can play with virtual word magnets online, but it doesn't look like it's possible to combine the different vocabulary sets.
As it happens, there are a lot of kits with varying vocabularies. The genius kit is particularly fun. Ah, the challenge of using "obdurate" in a poem.
Well. I found a new word magnet product today: diagnostic refrigerator magnets. I must have them. Although explaining some of this stuff to my eight-year-old may be a bit of a struggle when she comes in to use the magnets.