If you scroll down on the “Full Key Set” product page you can see renderings of the various key sets. The keys are all black text with pearl/pebble keys like on the original IBM keyboards, with some exceptions like Russian-Hebrew-English and APL where some text is red or orange. Of course please disregard the color of the boxes around each key – they are not printed but are to show the boundaries of each key.
There are some custom extra keys available in Green (like Alt, Print Screen/Sys Rq, etc.) on the Extra Keys product page.
The APL sets are currently made by Unicomp and I believe are red/orange – there are many photos of these sets online.