a fellow co - worker swears to me he had gotten white jalapeño plants from a fellow store owner who has since passed away , ask me if I could locate seeds , he did say they turn red . might be what you have in the pic .
I may be able to locate some white paint
Kidding, never seen a white jalepeno..just know there is a grocery store in central Texas where we hunt that gets large Jalepenos that have all orange inside and they are brutal..char them and make pico de galo and it will kick *ss..I usually bring 3 to 5 pound of them back home..must be from mexico as they are exetremely hard to germinate but this year got a few to go..I guess the xrays didn't kill the seeds this time
Do not know of any white jalapeno, but Yellow Hots from http://chileseedusa.com/index.html are like smaller fairly hot jalapenos. The group of peppers 2nd from top are some I harvested last season. They are good producers, I only had two plants and had a huge amount of them.
Maybe it'd be better to know why he wants them. If he just wants the thing he saw before, sounds like you found it; if there's something he actually wants to make, maybe white sauce or light powder, we could probably provide much more useful input.
At work, when someone asks us to build something specific, we usually come back immediately with "what's the actual problem you're trying to solve?" The answer to that question invariably leads to much better results.