That's a nice customized touch. I like how you matched the font colour to the seat trim. Besides price, my only concern would be that they might be covered by rubber mats; I haven't quite go to the point where I ask people to remove their shoes before entering the Ion (yet).
BTW, did you know that under the right circumstances, it's possible to get the Accelerator Pedal wedged under a rubber floor mat? After flooring the gas, I was alarmed to see that the rpms were bouncing off the rev limiter with my foot off the pedal! I stomped on the accelerator again and it popped back out.